Adobe keeps hitting it out of the park, IMO. In today's release (12.4) they've "fixed" (to my way of thinking) the curves panel that is available in the Develop Module and (more important) in masks. I was disappointed in my long anticipated addition of curves to masks, in that the concomitant increase in saturation along with contrast was way over the top. Now, when you are using an RGB curve (as opposed to either R G or B individually) there will appear at the bottom a "Refine Sat." slider. 100 is their current default in added saturation, and zero is no saturation added at all (like Luminosity mode in PS on a curves layer). Hurrah!
Also, now in the HSL panel, if you are using the tat tool, if you hold down Alt/Opt while adjusting it will gray out all but the color range being affected. Hurrah again.
And, there are also now the grain sliders for masks.
Nice going Adobe!
Rand