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We're dropping into UIKit land quite frequently but for the user of the API, that remains implementation detail and while likely change as SwiftUI advances.
Ironically, a "Stock iOS" style app like Mail or Contacts is much harder to pull off with SwiftUI than an app like AirBnB that brings has its own design aesthetic and establishes its own conventions – cooperating closely with your designers and keeping them aware of what's easy/hard is a much better use of your time than trying to rewrite a pixel perfect `UISearchController` clone.
That said, navigation remains a complete mess and I hope that's a top priority for iOS 16.
[1]: You might find this relevant to your interest if you write SwiftUI for a living: https://movingparts.io/variadic-views-in-swiftui
ItaloBrothers - Stamp on the ground. 2009. https://youtu.be/cHcVU5cGUNE
Basshunter - DotA. 2008. https://youtu.be/qTsaS1Tm-Ic
Taylor Swift may argue that she's entitled to a better deal since she drives traffic, similar to how Apple Stores can negotiate better rents in shopping malls.