Quite new to this forum, quite new to Darktable and quite late in this topic, I still try to contribute.
Hope this is OK.
I am also impressed and challenged at the same time by filmic RGB. Improved contrast in all dark and higlighted areas of an image is always a compromise. This because when someehere expansion (contrast improvment) is created with filmic RGB, it is inevitable that elsewhere compression is the result. So filmic is not the primary tool to “improve” the dark or bright areas of a photo.
Please find attached my trial to get some snow details. Not really good (vignetting!) and only a proof, that something can be recovered in the snow areas.
DSCF8284_01.RAF.xmp (56.6 KB)