Not a Photoshop user, so I may be misinterpreting that, but doesn't this outright remove some functionality from the hue/saturation panel? That "global colors" dropdown seems to be gone and the two "before/after" color bars were somehow merged into one.

This looks like it would require deeper changes to a user's workflow.

(Of course the missing focus/tab functionality does the same in breaking keyboard-driven workflows that worked before)