Well, you can almost surely write entire apps in QML if you take the C++ entrypoint for granted. Just a couple examples: you can do Bluetooth discovery scans i

Well, you can almost surely write entire apps in QML if you take the C++ entrypoint for granted. Just a couple examples: you can do Bluetooth discovery scans in QML without writing any C++ [1], you can read from ~20 sensors without writing any C++ [2], you can write complete 3D scenes declaratively in QML [3], and the list goes on. [1] https://doc.qt.io/qt-5/qml-qtbluetooth-bluetoothdiscoverymodel.html https://doc.qt.io/qt-5/qml-qtbluetooth-bluetoothdiscoverymod... [2] https://doc.qt.io/qt-5/qtsensors-qmlmodule.html https://doc.qt.io/qt-5/qtsensors-qmlmodule.html [3] https://doc.qt.io/qt-5/qt3d-wireframe-example.html https://doc.qt.io/qt-5/qt3d-wireframe-example.html