Dart is really not much different from a PWA/Ionic though: the language requires bindings to use native APIs; it's runtime is not native to any platform (where as most platforms do have native web runtimes); and it's rendering system doesn't support native widgets (in fact, it currently uses Skia which is the same rendering library as Chrome).
And yet, it has much higher adoption. I think it might be because PWA have long been second-class citizens on mobile, even with some recent OS updates.
