I kind of agree. This feels more like a master slave RC combination. Thats fine for RC planes were you can plug yours into the other guys unit and help him out, but this is a Mavic and I just don't think that it is complicated enough to fly that anyone would need help or even want it. The idea of the person operating the craft having a slave pilot for filming is ridiculous because as you said it only has one camera.
IMHO what would have been better is just a black box with antennas that allowed a second person to tap into the Ocusync and watch the flight. My friends and wife would be more eager to go on flight outings if they could actually participate and be able to see what I am seeing. Plus I would love the help in having a second pair of eyes watching the battery and signal levels.
Rob
Have you tried litchi vue? It's supposed to do this.