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Does QML even have any system theme support? AFAIK its more of a replacement of web technologies than of QtWidgets.

Yes, nowadays QtQuick, the GUI library that is generally associated with the QML programming language, supports native styles: https://doc.qt.io/qt-6/qtquickcontrols-styles.html

Doesn't look like it supports either QtWidget styles or GTK styles, which are the platform styles on Linux.

Lacks a Microsoft Fluid style for Windows 11.

It's in the roadmap afaik, they talked about it during QtWS