So many things new, or different, in 2.3, I feel guilty suggesting something else…
Sideways collapsible Palettes. I hate to suggest pinching from them, but Infinite Painter does this so well…. (And maybe the sharing of ideas is how everyone develops).
Sideways-collapsible Layers Palette: (Optionally) always visible: Full width, Partial, Minimal - each easily accessible, switchable, and fully hidden if required.
And the same with the Brushes Palette, where editing can be done in either full width, or compact. And, again, having the Brush Editor optionally left visible and, importantly, still active while trying on the canvas different changes being made, is invaluable.
While on the subject of Brushes... I just can’t understand why edits should be discarded when changing brushes. Retain edits until a ‘Reset’ button is pressed: that seems logical (and something other Apps have, belatedly, realised!)
I know a brush can be duplicated, and changes made to that, but - if in a Default Group - a new Group is added, confusingly full of the same brushes as the original; plus, unless the name of any edited version is changed at the right time, they can appear as identical copies.
I do have other comments I’d like to make, but will post separately. Don’t want to jumble things together.