This is something I've also wanted, but not understanding the technical challenges to implement it I really don't know if it's feasible for Spotify to take on.

This is something I've also wanted, but not understanding the technical challenges to implement it I really don't know if it's feasible for Spotify to take on. Similar solutions I've seen to this have been fully contained within one hardware product line. Like some bluetooth speakers of the same manufacturer can interconnect and play the same audio together, or things like amazon alexa.