> I can absolutely see that being more attractive especially with things like the Duo where, I assume, SwiftUI gives you a number of things "for free".

Apple may not trumpet it as loudly, but these freebies are handed out in UIKit too, for cases where declarative UI is cumbersome.

Generally I've found that while SwiftUI is great for little self-contained bits of UI like table/collection view cells and simplistic template-like apps, it tends to become a bear with complex apps, so it's nice to have both options.