The Rig and the ID are just larger overbuilt GriGri's. The work position off a GriGri that was mentioned was likely a Grillion.
You can all use what you want, but a GriGri is more than capable of any of the tasks you would use a Rig or an ID for, except possibly primary rescue, which it will work but the Rig or ID may be better suited for.
For RADS Srt, lowering small loads, hauling, mechanical advantage, tensioning lines, rappel, crane work, self belay, or many other things the GriGri is IMHO far better than the larger heavier ID or RIg. Plus I am not a fan of the plastic biner traps on the other units.
GriGri's have been used and put to the test for over 2 decades. Besides rock climbing lead-belay accidents (user error), I am not aware of any failure associated with the device.
The Rig and ID may not be stupid, but they 'dumbed down' the function of the GriGri.