I can imagine being a developer on this product would be insanity. They probably implemented the Airplay feature, showed it to their bosses and for whatever reason the higher-ups had their reasons for nixing the second screen... Then they thought -- Ok, so we can't do video but perhaps people would want to airplay the audio to their fancy pants audio setup in their homes, better than nothing, right? Wrong.
I hope the big media companies get their acts together. They only get to screw up a finite number of times before someone comes and blows them out of the water