I am clear on what you don’t want, ie no filmic as the default… What I am not so clear on is what you want… At this point its a bit like me being annoyed by the default font Microsoft chooses for word or the margins or whatever… They are not set in stone but they are a design decision I would guess about what is the best starting point…
Filmic supports a pixel processing pipeline created by those developing it designed to process the data in a linear scene-referred way. This was a direction of the software and the gateway for that pipeline to the display was filmic which evolved over time. If you were using DT for other reasons ie not this workflow but because you like the software then there is the option for a starting point via the basecurve and even some tools with darktable chart for example which can be used to come up with a starting style to match the jpg (I think this might be broken but it can be used in 3.6). Or like me you can set it to none and evaluate the image and decide how to edit it…
In this case the defaults are what they are to support the design philosophy of the software. And they are not set in stone. If people read the manual they can understand why this is and what the goal and implementation is and also what the options are so they are free to experiment. Just as is required with a number of the modules so as to find what settings give you the perceptual look that pleases you…
So after all that would you say the default should be none and if not what should it be in your mind rather that what it should not be…