I tend to agree with much of the criticism of SwiftUI, namely that it and the underlying mechanism (result builders) is over-indexed on the UI-for-iPhone-apps use case. But I think Swift's greatest strength is what I mentioned in the parent comment: progressive disclosure. You don't need to use result builders and if you don't, the complexity of the language stays the same. I contrast that with C++ which has added some powerful, complex features that underpin most of the language, making it more necessary to understand the full scope of the feature set to get anything done.