Okay, I gather that now it doesn’t matter which order exposure and filmic are turned on. So, as I said at the top, using scene-referred and after importing if I need to adjust exposure it is not necessary to temporarily turn off filmic in order to judge the screen image for exposure adjustment. Have I got this right?
It’s not necessary. Just see, if the mid tones seems to be right and the drag ghe midtones in the histogram until the appearance is ok for you.
But it makes sense to do adjust exposure before tweaking filmic settings since you might need to redo this after changing exposure.
Look at it this way:
you have an image which ‘as is’ has the highlights (say clouds in a landscape) just right. So nothing to do in filmic, but modifying contrast and black point.
But the foreground (for one reason or another) is way to dark, so you want to apply 1EV extra exposure. No problem, except that now you have to go back to the filmic module to correct your highlight, which also got that extra 1EV, and are now overexposed…
Exposure first, then filmic (this means exposure module is listed under filmic module).
Setting exposure with filmic enabled or not is up to you.
Changing exposure with filmic off might trick you in paying to much attention to what the shadows and highlights are doing. You really should ignore them. Highlights might me clipped to oblivion, then you turn filmic on and they are back :).
So,change exposure with filmic on to have a more complete final output while you change the slider. But it might be harder to understand why certain things are happening while you are changing exposure.
Changing exposure with filmic off might be harder for people because they see stuff in shadows and highlights happening which should be ignored. It’s midtones only.
I started with filmic on,now with color calibration in there I always leave it off until I set exposure and color- cal to a decent start.
The picker and the 'ai’options in color-calcan have a hard time with lots of your image completely clipped. So I always return to them to see if they do something interesting after I set filmic.
Can you please clarify? If scene-referred and modern are set in preferences are you saying that one should not turn off filmic to adjust exposure, but one should turn off color calibration to adjust exposure?
Bakubo you will generally need to go back and forth. Unless you specifically change the order of module execution…exposure happens early in the pipeline…filmic much later and inside the color profiles. no matter what order you complete them in your workflow or turn them off or on they will execute in that order. What @jorismak is saying is that it might be easier to tweak exposure with filmic on as what you view on the screen is the combined effect so if you do it with filmic off taking in to account shadows etc etc just how you like then filmic will change them…so its easier if filmic is already in place to assess your exposure tweaking. The initial exposure is only added as a guess to boost the starting point for filmic. In the past it was not added and people were freaked out about how dark or crushed their images were. Most JPG files have an ev bump and so this simulates this…filmic maps your dark and highlights around the point that you establish for middle tones…so hence the advice to add some exposure to get your mid tones right and then apply filmic…now following that logic even after adjustment filmic might leave you with the need to tweak exposure so just tweak exposure…there is no magic order…in fact I enable the old middle grey slider in filmic and use that so I don’t have to leave the module to tweak it…lower for lighter higher for darker…there are many ways edit but there is no magic effect of the order in which filmic and exposure are added the end calculation is the product of the two…its just a workflow suggestion you may prefer to set you preferences to none and then enable the modules in that order ie exposure and then filmic if that works for you…basically DT is trying to guess and set exposure and then apply filmic. Through experimentation you may find a better starting bump to ev for your camera and if so you can change that but there is going to always be some back and forth with filmic. I believe @jorismak is saying that he now prefers to leave filmic off and set exposure and color calibration and then enable filmic…not as you understood it…usually you will set wb then exposure in a traditional approach so you would do your color cal and then set your exposure and then continue from that base…
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Thank you. I think I am going to stop being concerned about this and just adjust exposure without turning off filmic and color calibration. 
That is easier since they are already there and turned on when I import a photo.
Thank you to everyone who replied.
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You need to take shadows and highlights into account to set the correct midtones - so it‘s helpful to optimize in some cycles with filmic is active. It‘s notabout absolute numbers, it’s about your perception of the image. But this is dependent on the overall view
from Illusion of brightness or lightness
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As somebody who spent a lot of time in the B&W darkroom 50+ years ago, I often find it helpful to temporarily enable the monochome module before adjusting exposure, and assess the picture from there.
I question whether this could be taken a step further by using the colour picker to assess where known midtones sit. For example, a grey card sat amongst correctly exposed mid-tones, would have a monochrome RGB value of 127 127 127. IIRC under the same lighting, untanned Caucasian skin would be approx 153 153 153. Given that our eyes deceive us but our pictures are likely to include a suitable person, could colour picking be a way to appease those looking for a scientific way forward?
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It’s not relevant where a grey card midtone is located - it’s just relevant what you think should be midtone in your image. Because this is kept constant in filmic.
Unless you are editing images of your greycard 
I accept what you say, and I personally have a good grasp on filmic. I can however see why lots of folks are confounded, and in my view some of this can be attributed the evolution of filmic in its various guises and the fact there is lots of outdated advice out there.
Aurelliene has in the past mentioned including a grey card and sampling from it. Bruce Wiliiams posted a video describing a Caucasian human face as being middle grey (which well-tanned Australian skin could well be).
This makes me wonder whether references to mid-tones and middle grey should be replaced with “the important bits that are to be preserved” or somesuch .
Following this for some time now it seems to me because the module is quite technical many people feel the need for a technical approach and others offer the “edit with your eyes” suggestions which does work better IMO but it becomes a circular argument as there are always going to be those types of users I think, ie those that seem compelled to edit by following numbers boundaries and thresholds and then there are those that understand them as guidelines and indicators of change however their edit is based more in response to the visual representation of the image. I think the point is not to convince people of one over the other but rather to suggest all possibilities and get people to use what works…I don’t know what it is about DT but so many people phrase questions about the right way to do things when in reality DT offers so many ways to solve most image problems yet it seems to impart this “correct way” mentality. I think this may stem from the fact that DT can be complicated with all the options and math centric sliders and parameters but more so that it is a tool that really requires understanding on a number of levels about color and digital images and other foundational aspects that many users are not well versed,
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In my experience, this happens in all enthusiast forums and communities. But I think you nailed it with your first sentence, which can apply to DT in general. Darktable lays the underlying mathematics and science bare much more than many commercial programs, so I think many users feel it needs a much more mathematical and scientific approach to processing.
BTW @priort, do you post on mobile? I always like to read your posts but I fear your message sometimes gets lost in a wall of text. A few paragraph breaks and clear sentences would help a lot. Just a friendly suggestion because I feel you represent that group of users that sits somewhere in the middle between the programmer-level enthusiasts and the non-technical users who just want their photos to look good (often found on other forums). I know you’re active on FB, helping users out over there with your knowledge gleaned from this forum, and I think this ambassadorial role is useful and important. Apologies if I’ve assumed too much!
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There’s another aspect to consider. The problem with editing only with your eyes is that the number of variables (sliders) is too large, and since they are interrelated, it quickly becomes very difficult to find a combination that works, especially for captures that are suboptimal to start with.
At least for me, I want to understand what is going on from a technical standpoint to reduce the amount of tweaking required to get a good image – not because I want my image to be technically correct. For example, if I can nail down the exposure, I may then forget about that slider and concentrate on the remaining ones.
I often use my phone…thanks for the feedback. I should strive to be more clear. Thank you for taking the time and effort to articulate your comments…
EDIT…please note there is no sarcasm intended what so ever in my reply. I genuinely appreciated the feedback it was spot on. Nobody need to suffer a stream of comments in a run on sentence…Thanks again
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Miguel, I could not agree more. I was trying to express that there is often a disconnect that begins outside of darktable. Not having a fundamental understanding of color and basic digital editing when trying to use a tool like darktable to edit pictures will always be less than what it could be. Given this common deficit at the start it seems like many people approach the edit as though DT is a replacement for this knowledge gap and there is a magic combination of sliders that works or will produce the correct path to the end result.
At the same time it might be great to edit with your eyes but if you don’t understand how to give your eyes what they desire then having a bunch of sliders wont help even when you might roughly know what the slider does in the module
So I think both aspects ie the technical knowledge and having a keen eye and visualizing are important, I just think that the missing link in processing between start to finish is often color theory and basic image editing concepts rather than mastering DT…if that makes sense
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No sarcasm read. Thanks!
It’s often not clear until after you read something a couple of times how it might come across and even then you can’t always be sure…
So I just wanted to make sure.
Appreciate it. It’s always a pitfall of online discussion and email that the tone is not always obvious. But your comment seemed completely genuine and I’m glad my comment wasn’t taken as criticism, because that was definitely not the intention.
Mid-grey (18.4%) is 119 in sRGB (and 50% in L*a*b* - that is filmic’s neutral point, as mentioned above). See Middle gray - Wikipedia