Can you guys make it so ARC streams the music straight from Qobuz (or Tidal) without having to connect to your core?
It already does, but you have to connect to your core to tell Roon what to play. Otherwise, just use the Qobuz app.
And the Roon user interface leverages the metadata held in the Core.
You may be listening to something on Qobuz and ask Roon what else this artist has done, and it will include albums on Tidal (if you have a subscription) and in your home library (if you have one). The Qobuz app doesn’t do that.
But once you have selected the music, ARC plays it directly from Qobuz.