Because unless you have a mesh wifi system or some other weird network
issues, this works just fine. I replaced my mesh with a single router
and I'm back to casting to all five speakers in my house.
Speaker groups were working great for me, though after adding a lot of
smart home devices, I started getting some skipping/stuttering when
casting to all my devices. So I got a mesh router (Deco W6000), but
that's only made things much worse. Like so...