Yeah, welcome to a new world I guess.
So here's another question.
If you have some of their high end speakers, like 17/18/5/50/90s and have an audio source connected to it - lets say a streamer, be it own brand or other - how do you expand the experience to other rooms. As those speakers are not AP themselves. I guess if the streamer is AP capable, then it will work. But a vinyl player connected to 50's for example? Hmm.
I get it with TV's - as all future B&O type TV's (they're not Beovisions any more, not in any meaningful sense) will have a speaker part a la Stage, which is Airplay equipped. And in this case, a broadcast or movie playing on this setup with sound coming from the Stage lets say, I'm guessing a Balance (for ex) can join via AP. Although licensing restrictions may apply depending on the content - SKY TV's app on iOS and OSX places restrictions on what can be airplay'ed. Another wrinkle - not entirely under B&O's control, and you could easily find yourself stuck.
Anyway, the absence of any built in sources in the Balance does point to the future - one where they have conceded multi-room control over to Apple and Google. Inevitable I guess, though its not quiet clear to me why both couldn't continue to coexist in the way they have over recent years.