Eeeehhh I'm gonna disagree - most open source macOS projects have those bugs because it lacks the resources/dev-power to keep up. Windows and Linux in comparison tend to have much more in the way of developers willing to contribute.

Cocoa/AppKit rarely change, and it's often one of the bigger complaints with it. Big Sur is probably the most radical version change set in years, but to say Apple "keeps changing things" for Cocoa/AppKit is not really correct.

Also, if it's not clear, I _do_ read other documentation. I still think wxWidgets needs work, and one of the devs even admitted as much in their response to me.