I listen mostly to progressive metal, which is kinda niche, and I’ve found pretty much anything I went looking for. Not sure about indie acts in general. Try browsing their download store - my only gripe with them is that the UI is pretty bad. The service is solid, though.

Also, seeing as they are DRM-free downloads, you could use Qobuz as a supplement to bandcamp for bands that are not on bandcamp, or vice versa :)

Shout out to Qobuz, I started my digital collection there. They sell DRM-free downloads in FLAC format (when available, otherwise MP3)

I use Lutris, and it works really well. A native Linux client would definitely be welcome, though!