Ah yes, good point... I use Apple Music via my AVR in my home theatre, but was considering the Ultra for my bedroom... in which case I either need to keep Spotify for the bedroom, or not go with an Ultra at all, and instead go with the Pro... :-(
I was wondering the same thing when I read that... as far as I know, Spotify doesn't have High res audio, or Dolby Atmos for that matter... unfortunately. I recently subscribed to Apple Music for their Dolby Atmos support, and will likely drop Spotify.