I mean, if the functionality was there before and was removed, they kind of have a point. Again, Sonos is making the same change. If it was just Spotify, sure, I could see them just wanting to whine.
Besides, why would Spotify put in extra effort when Apple wouldn't? They could add Spotify Connect to Homepod and we could all be happy campers. Sonos has it on their speakers. Instead, because both Apple and Spotify suffer from NIH issues, we're here debating in circles about which tech giant is actually the boogeyman.
It'd be nice if these kids could just play nice with each other. Heaven forbid we have a better user experience.