yeah in that regard it seems that apple tastefully does so on apps where there's mostly remote roundtrips already like the app store or music app, so I agree that there makes sense to reuse the web infra
but swift ui apps are great and fast cause they're not electron monsters!
thankfully you can use safari webkit inside them, but that doesnt work cross-platform
SwiftUI apps are not great and they're not fast. A lot of Apple's new apps are considered rather poor. Theo has a video where some devs switched to a webview because the text rendering performed better!