That is correct. The Application Programming Interface (API) that Qobuz (or TIDAL, or Deezer, etc) provides to 3rd parties does not have everything that their native app has. The API evolves later than their app and eventually that functionality makes its way to the 3rd party apps (i.e. BluOS, LUMIN, Lightning DS, etc.).
Sometimes, a developer finds their own solution. Check out mConnect Player (for iPhone) or mConnect Player HD (for iPad). They are paid apps, but very cheap. Recently, they added Qobuz sorting and TIDAL “My Mix” playlists. These are features not available in *any* third party controller app. So either the APIs have evolved and they got early access to them, or they are solving the problem by implementing a solution on their own. Either way, if Qobuz sorting for favorite albums or tracks (i.e., by Artist, or by Name, or by Date Added) is something you really want, try out the mConnect Player apps. They are very good in my opinion for UPnP/DLNA control.
Cheers,
M1k3