A dedicated music app?
Music filtering/smart playlists? Sonic analysis?
Good 4k/x265 performance?
Has a third party (or built in) utility that shows me streaming usage per person?
Allows me to limit remote users to streaming from a single IP address at a time?
Let’s me watch something together with another remote user?
Has an app for most any device (like Plex or Emby) that does NOT require sideloading?
Has built in native DVR steaming/recording support?
Two factor authentication?