I recently started using the U2 Mini and stream with Qobuz and while I found the app to be NOT the most intuitive it got easier once I read through the online tutorial.
I use the Lumin app as opposed to the Qobuz app- there is a momentary delay when loading up a new album but no more than Spotify or other services. One thing that did get confusing was how to add favorites by album instead of by track or artist- it all depends upon where you add from. I don’t like that when I select a track from the album info side that it repopulates the tracks in the queue. I’m sure there are other quirks t be found but overall I wouldn’t say that the Lumin app is garbage- just takes a little work.