SwiftUI is Apple secret sauce. That’s never going to be released.

All the compiler features are there. Others can make similar libraries or other new libraries.

But I don’t see why Apple would ever release that outside Apple land. Swift can still be used for shared logic and server stuff and command line tools and GUIs using other libraries.

You don't 100% need them to release it, there's projects like Skip:

https://skip.dev/

Which was open sourced sometime back, and builds iOS and Android apps, which is really neat, because it means your Android app's logic etc is all natively compiled, only a shim of Java to run it. I wish Google would let people publish standard compiled binaries for their OS instead of just making everything rely on the ART.

Honestly, I am jealous of the number of RAD IDEs from the 90s and early 00s we need to start investing in good tooling again.

Incidentally, there's a nascent OSS project called OpenSwiftUI.

https://github.com/OpenSwiftUIProject/OpenSwiftUI

Not to mention it’s built on top of Apple’s other private UI frameworks