>the Spotify app no longer controls volume across devices uniformly
I actually really enjoy this feature myself - all my devices need to be at different audio levels to not blow out the speakers, so having per-device (or virtual device via Spotify Connect) control is great.
I'm saying it worked but now it doesn't work as well as it did. I don't use the Everywhere group. The Marantz app (or the iPhone app) is absolute shit because it starts at some random volume and goes up or down huge amounts. Instead, I'll use the Tidal app because that at least doesn't fuck with the volume or end up overdriving my mains and 5 kW sub.
I actually really enjoy this feature myself - all my devices need to be at different audio levels to not blow out the speakers, so having per-device (or virtual device via Spotify Connect) control is great.