The important aspect of SwiftUI is tight integration with AppKit and UIKit. SwiftUI for Win32 (or whatever) would be a completely different beast.
There's nothing stoping anyone from implementing such a thing, just as someone wrote a SwiftUI for HTML. All the pieces are there, but it would be a huge amount of work unrelated to SwiftUI on Mac and iOS.
There's nothing stoping anyone from implementing such a thing, just as someone wrote a SwiftUI for HTML. All the pieces are there, but it would be a huge amount of work unrelated to SwiftUI on Mac and iOS.