Why is the Remote Controller that is shipped with the Air 2S OcuSync 2.0, but the video transmission system is O3?  Is this a compromise system?  Why wouldn't the Remote Controller have O3?  

I'm finding all these early YT videos praising the O3 ability of the Air 2S, but the actual remote controller is still OcuSync 2.0.  It would seem to me the ultimate transmit/receive system would be O3 on both ends.  I just don't understand.  If someone can explain, I would appreciate it.

+1 - agreed, I’d like to hear a clear and definitive DJI response to this totally legitimate question.

Maybe because the remote control was released in early 2019 well before O3 and the air2s and was built to work with all the other drones on O2 ?

As far as I'm aware O3 is just extra Antenna on the aircraft, no change to RC.