Actually this a very common practice for Apple and well known among seasoned devs. Apple’s shiny new things don’t really belong in production apps until a few major versions in. In my decade of iOS development experience prevailing wisdom has been that nothing has ever worked until at least a few major versions in and don’t belong in production apps unless you really love rewriting your entire codebase.

Good rule of thumb is an application usually needs to support at least one prior major iOS version and SwiftUI is only available on 13. Don’t know current adoption numbers but I believe there is still a significant % of users still on 12.

Just don’t be surprised when SwiftUI apps require major refactoring to work on iOS 14.

I haven’t even touched SwiftUI yet as I’m orders of magnitude more productive with RxSwift and every single realworld-ish example implementation I’ve seen makes my eyes bleed.