PS5's non-game feature set is objectively worse than PS4!
Feature PS4 has that PS5 can (won't!) do:
Web Browser (I'm aware there's a trick)
DLNA music playback.
DLNA Video Playback.
Tidal playback (Via Plex app)
Themes
Curiosity Stream (despite PS4 backward compatibility - which the Spotify app used till the PS5 app was finished!) 
Remote Play via PS Vita 

 Why would you want Spotify on ur PlayStation just use a USB with ur playlist god.