Comment by LeoNatan25

Possible? Maybe. Desirable? No, not all. Don't get me wrong, AppKit is very much in need of a modernization, and it definitely is not as actively improved upon as UIKit is, but the two have very little in common from a design UI/UX standpoint. What has Microsoft shown with their multi-paradigm direction? That lowest common denominator is bad. And same would be for a possible "UXKit".