The addition of HSL controls for the adjustment brush and the gradient tools would be a wonderful advancement and offer LR another great feature set that I'm sure would come in handy for the vast majority of Lightroom users.
I wanted to pass this on to the developers of Lightroom (and even Adobe RAW). This would be a feature people would hopefully find useful. I always assumed it would eventually be introduced, but it still hasn't been - so here we are 🙂
The AI face masking is a fantastic feature. The ability to select faces, other skin, and individual features is such a time saver compared to manually selecting. Now more than ever it would be very beneficial to have the HSL/Color panel available for individual masks. Teeth yellow? AI mask, go into yellow and lighten/desaturate. Bloodshot eyes? AI mask sclera and go into red and lighten/desaturate. You can do a universal color saturation and lightness adustment but not specific colors. This doesn't give the same great result that being able to work with the specific colors can give. If possible, please add this feature. Thank you.
I love the new maksing features in Lightroom Classic. Since you added the tone curve I think it would also be beneficial to add the Hue, Saturation and Luminance, HSL, panel inside the masking feature. Thank you!!!
With today's release of Point Color, this has taken another step forward:
Point Color for Global and Local adjustments allows for a three-dimensional (HSL) selection of and adjustment in three dimensions (HSL) of any color on your image with the option to refine ranges and outputs.