It's not obvious at all, for wireless speakers, especially in complex multi-room setups. If it were obvious and easy, then everyone's wireless audio products would handle this as well as Sonos does. But they don't. I bought two Sonos One SLs and had them set up as a stereo pair that my Apple TV could talk to almost instantly. Then recently I got a Sonos Beam soundbar and wanted to use my One SLs as surround speakers. I expected a long, painful setup similar to what I've experienced with competing products. Instead it was seamless, easy, and delightful, and I haven't had to touch or mess with the setup at all since.
There are also a lot of details like how to handle time delays with a large set of wireless speakers so that sound is synced with a TV picture, comparative volume adjustments for a given acoustic, etc.
Did you read the patents or any other reporting on the patents or this case? For instance:
https://arstechnica.com/gadgets/2020/01/in-a-flashpoint-for-...
https://arstechnica.com/gadgets/2022/01/google-loses-sonos-p...