It's really not an impressive showing for SwiftUI. 4 iterations later and after being told it's "the future" in unequivocal terms, it's still at 12% (and only like 3% without any AppKit combined (last chart)). It's not dogfooded for any productivity apps. For Ventura, rewriting "Font Book, System Settings, and Tips" is not exactly confidence inducing. If they rewrote Pages or Final Cut Pro, that would wake people up.…
I'm converting the iOS version of the app from UIKit app to SwiftUI and it is a nightmare. Nothing works, everything is tightly coupled, and nothing works out of the box without some hacky modification and much googling. I've also come to the conclusion that they don't use SwiftUI before releasing it.