As I can see, the Action class was added to the QtQuick.Controls 2 module. I believe this is a wrong decision, the best place for this class is the QtQuick module. Actions describe the application logic and do not depend on the UI implementation.

The lack of a standard Action class is evident in Qt.labs.platform. There could be the MenuItem::action property, but making dependency of Qt.labs.platform on QtQuick.Controls(1 or 2?) is not a good idea.