#What Multi Room Actually Means
A Bluetooth speaker plays your phone. A Sonos system plays your house. Speakers group and ungroup on command, the same song follows you from kitchen to basement, and a phone call never interrupts the music because audio streams straight from the internet, not from your handset.
That architecture is the entire pitch. Start dinner with jazz in the kitchen, send the same playlist to the porch when guests arrive, then peel the living room off for the ballgame, all from one app that speaks Spotify, Apple Music, Amazon Music, Tidal, and about a hundred smaller services fluently. Ecosystem prisoners take note: unlike the HomePod, Sonos does not care what phone is in your pocket.
The trade is that you buy into Sonos itself. The app is mandatory, the speakers are useless without it, and the occasional rough app update makes owners grumble loudly. The hardware, though, routinely outlives a decade.