I have the same question about YouTube Music—it's actually at the point now where YouTube proper does handoff better then the music app does, but Spotify is still way ahead of any other company in this area, including seamless handoff and using your laptop/phone as a remote control for a desktop or a different phone. I think most people just don't have multiple devices tbh, so companies don't see it as worth it to invest in multiple device coordination features. I wonder what the Spotify usage stats are.
