I think in general, the key benefit of darktable is it teaches you about image processing, exposing quite a bit that is useful to know.
Darktable, especially watching Aureliens videos on the bit reduction from real life to 8 bit images which is what most of us see on our screens, was illuminating. Filmic like sigmoid is simply one way to create the mapping from higher bit depths to lower bit depths, which maintain the most useful information, in the mid tones.
I tend to use only two sliders “white relative exposure” and “black relative exposure”.
You could also see what the “auto tune levels” control does to the settings. It is a useful option, if you want a bit of “artificial” intelligence applied.
White Relative Exposure - is fundamentally a dynamic control, or a contrast manager.
Back Relative Exposure - how much of the image dark areas, do you want to crush into the blacks.
Dynamic Range Scaling is another control to adjust both of the above - using one slider, for a more contrasty or lest contrasty image.
In the good old days, all we had was the base curve module, which was a pain in the wazoo. Filmic is so much better, most of the time White Relative Exposure, does all that I need filmic to do.
I do wish though that there was a way to link by choice, (as an option, e.g a tick box) changes in the exposure module with the auto tune in filmic, so that filmic can auto adjust, after each change in exposure…