When Apple released AirPlay back in 2010 it was a revolutionary technology. The idea that you could send audio from one device to another was new and changed things significantly. But it was always a little limited as it's ability to send different audio to different speakers was non existent. Systems such as Sonos took the lead in offering affordable multi-room systems. But AirPlay 2 is here. Apple is pitching its benefits to the HomePod but I think it's going to be more useful for those using other speaker systems.