Let me start by saying that downloading music is not an edge case. Whether you're flying, commuting underground or have a limited data plan, playing music offline is incredibly valuable.
Deezer doesn't seem to agree. I have 1,000+ albums. Just accessing the downloads list on a Galaxy S25 Ultra freezes the phone for a few seconds.
Next, not all albums that I queued for downloaded actually download. A couple of hundred albums simply don't download without any clear reason.
Then, a few albums must have been removed because their context menu only shows a generic network error. There's no way to remove them.
Finally, I've asked for this before, but a "download all" button would have saved me literally hours.