Tangential but your comment reminded me: years ago (I hope this is no longer true) the iPhone would, when pinged via "Find my iPhone", play the alert sound to the current output.
So if my iPhone was playing music via AirPlay, the alert sound would go to, you guessed it, the AirPlay speakers. Completely pointless.
So if my iPhone was playing music via AirPlay, the alert sound would go to, you guessed it, the AirPlay speakers. Completely pointless.