(Adding this as a comment because I'm over my edit window.)

I want to add a third category to the categories that make sense as native apps: apps that are built by the platform vendor (and potentially shipped with the platform).

GNOME apps are built with GTK+, KDE apps are built with Qt, and macOS apps are built with SwiftUI/AppKit. This is how it should be. Microsoft is the only outlier here, shipping apps built with everything from Win32 to React Native to Electron to their own WebView2.