Best part is that neither of those follows the "native style" either.
There's no dark uxtheme provided by windows, so Qt falls back to their fusion style. Even the "native" light theme doesn't follow the new "fluent" style so that's also a shitshow.
As for WinUI 3, apps are supposed to bundle it, so if you target Windows 11 and run the app on Windows 10, it'll look all rounded and drop-shadowy instead of flat like native Windows 10 apps. Great stuff.