Qt is native, if you talk about running compiled and linked code that directly accesses native resources (C++ will work directly with the Apple OS).

It is its own application framework (windows, buttons, labels, etc.), but, from what I can see, it does a damn good job of using native system resources, where possible.

The answer to the OP is "it depends." There's no "Philosopher's Stone" for cross-platform development. I'd say a significant number of applications could benefit from Qt. A smaller number, from other hybrid systems. A lot of good development tools are Qt-based, and I like them fine.

I have no experience with mobile Qt, though. Might be a different kettle of fish.

I write native Apple, using Swift, and native frameworks, like AppKit, UIKit, and WatchKit. I have not yet started working extensively with SwiftUI, but I like what I see (except the documentation).

I feel that true native development will always deliver the best UX, but, for many applications, the difference may not be worth the extra cost.