That’s a good point, in fact, the Darktables manual has a note about this.
filmic rgb tends to compress local contrast, so after you have finished adjusting settings here, you may wish to compensate for this using the local contrast module.
I personally apply a local contrast preset that someone post in this forum, and for these cases the results are great, both for filmic and sigmoid.
(sigmoid just need to push the values a bit further)
