Would you mind giving examples where you use parametric masking? I read the docs* and it is not very clear to me the practical side (I'm a Lightroom user).
An example: Camera noise is often particularly annoying in the sky area. So I'll have two denoising filters active: A subtle one that doesn't lose much detail, and a strong one that only applies to the sky. Selecting the sky tends to be easy with a parametric mask: Just select the sky's hue and it's done.
* https://docs.darktable.org/usermanual/3.8/en/darkroom/maskin...