Earlier quoted context omitted.
The UI is actually native, it's just that the native Rust UI tookit it's using (druid) is still work-in-progress and doesn't have some things we expect from a full UI framework (most notably, good text rendering).
Sure, if by native you mean “not using the web”, but my understanding is that Druid, much like flutter, uses a canvas like renderer underneath and doesn’t use platform widgets. The fact that lapce’s ui - like its file picker - looks nothing like a Mac app is flat out obvious and makes me less inclined to bother.
Maybe you were emphasizing more on the theming/design principles than the technology behind it. In that area I just think Druid needs more work to allow using native dialogs for certain specific elements (file dialog, right click menu, etc.), which is what Qt already does.