I used the integration to fill in the gaps I have in my personal collection. With tidal, I could start playing my own music and plexamp would just drop in some new songs for me.
It would create some playlists based on what I listened to, which again helped to discover new music.
I could just start using tidal, but that means turning my back on my personal collection. Or I could give up tidal, but that means losing the recommendations.