> After being stuck in XML land for making UI for almost two decades I couldn't be happier to leave it behind.

this is completely unrelated to what QML is.

QML is a complete language which allows to build both the application logic and the layout, which extends javascript with native reactive data binding. QML+QtQuick is equivalent to Dart+Flutter, or JS+HTML+CSS+React for instance.

https://www.qt.io/product/qt6/qml-book/ch04-qmlstart-qml-syn...