I own at last count:
12 amps,
4 cd players,
2 tape decks
4 turntables
2 WiiMs
8 sets of speakers,
4 tvs
1 blu-ray player.
Yet somehow I only have 4 remotes.
I would argue most people have 1 of each at most, and as such it's a unique use case that WiiM won't cater to.