I’m just listing out all the baggage that monolith drags with it. The pct that wants to just listen to music or sync their phone is way hire than those with the expensive air speakers no one is buying. But they all get bonjour by default.
Most people may not buy specific AirPlay speakers, but for example if you have an AppleTV or AirPort-express they can be used for this as well. I use it a lot and I'm glad iTunes can find them!