When I first contemplated moving to Qobuz from Tidal, I contacted Qobuz about the size of their library (significantly smaller that Tidal). They assured me they were adding "thousands of titles daily". That has not been my experience.
PS Audio had created a "Playlist", with some of the evaluation tracks they used (all of the music in Tidal), which I downloaded when I was a Tidal user. When I switched to Qobuz, a much larger number of selections than I expected were not available on Qobuz. Many, many months later, none of those songs are yet available on Qobuz. Very disappointing.
As much as I hate doing anything to support MQA (and Jay-Z), I have given some thought to switching back.