You are missing the fact that Android team doesn't want to have anything to do with Dart, and started a Kotlin everywhere initiative, including iOS via Kotlin/Native.
Ready to go today if you're only supporting iOS 13+
Which for most companies is 2+ years away
Re:SwiftUI
by HillaryBriss on Tuesday June 04, 2019 @11:54AM
(#20096175)
To add a bit more detail: the required level for other Apple OSs are macOS 15+, tvOS 13+ and watchOS 6+.
Re:SwiftUI
by HillaryBriss on Monday June 03, 2019 @10:01PM
(#20091070)
I stand corrected. thanks.
I may be missing something, but SwiftUI seems to be pretty much ready to go today.