[MuppetMaster42]

That works in a single person household. But once an extra person wants to use it then each person has to do the dance of re-pairing every morning - which can be painful if the other person's device was the last one that connected and is nearby.

Being able to have anyone just walk in the shower and say "device play music on Spotify" and have it just work is much simpler and requires much less thinking and effort - which is really nice first thing in the morning.

Also a speaker you can't connect after getting in the shower, but a smart speaker you can.