MessageDialog (qt.labs.platform): Dialog Button Documentation wrong

Looks like the documentation is out of date. The examples are incorrect as is the "buttons" property documentation:

MessageDialog {
    text: "The document has been modified."
    informativeText: "Do you want to save your changes?"
    buttons: MessageDialog.Ok | MessageDialog.Cancel
    onAccepted: document.save()
}

MessageDialog.Ok etc. are not available, one must use StandardButton.Ok etc. instead:

MessageDialog {
    text: "The document has been modified."
    informativeText: "Do you want to save your changes?"
    buttons: StandardButton.Ok | StandardButton.Cancel
    onAccepted: document.save()
}

I can't understand why the important controls like FileDialog, MessageDialog etc. are still considered as experimental when their older counterparts in QtQuick.Dialogs still depend on the long deprecated QtQuickControls 1.

Also I consider the native menu support provided by qt.labs.platform as essential for desktop applications.