PX4 does not listen to MAV_COMP_ID_SYSTEM_CONTROL

PX4 only listen to its own component id and not MAV_COMP_ID_SYSTEM_CONTROL.
I have searched in almost any type of autopilot firmware including ardupilot and it seems that they all accept MAV_CMD with there drone component id and not MAV_COMP_ID_SYSTEM_CONTROL.
But to be honest I'm not quiet sure, before merging we should check this with people using different autopilots.