Standard list of complaints. That said, as of last fall I think something like 95% of users are on iOS 15. 4% on 14, and the rest scattered into that last 1%. And now we're already on 16.2.

So it's pretty easy to target iOS 14 minimum, or even 15, depending on the app.

Unfortunately, however, given how Apple ties SwiftUI features to iOS versions any changes coming tp SwiftUI in 2023 will no doubt be useful... in 2026.