I find Qt/QML for cross-platform mobile applications to be a great solution. It uses the same basic architecture as Flutter – they both do not use native widgets and instead draw the entire UI on a blank graphics canvas. I think that approach preserves the most code between platforms and reduces the kinds of presentation hitches that HTML web view and hybrid native widget approaches can run into.

In relation to the particular problems of technical debt related to third party modules mentioned in this article, QML rides on top of Qt which is a 26 year old C++ cross-platform toolkit with a lot of mature technology in it. I.e. there is a lot more "batteries included".

There are still plenty of times you have to "go native" to integrate something Qt doesn't cover but it apparently isn't as often as with Flutter.