I see Roon as a point of integration. I subscribe to both Tidal and Qobuz and log into those services in Roon. I would love to see more streaming services added to Roon.
As others have said, you can create playlists from CDs from multiple services.
Roon also provides multi-zone playback. I stream on two ELAC Discovery speakers in two bedrooms and on my main stereo.
The new Roon ARC app let’s be stream my saved music when I am away from home.
I think Roon is awesome. I bought a lifetime membership many years ago and haven’t regretted it for a minute.