Exactly - to me it is the same reason as grouping films - to keep the main pages clean
I would have thought this was a relatively easy implementation as the hide function already exists for films.
I suppose the issue would be that for films the collection data exists for in TMDB but wouldn’t exist in the same way for music so use of the function would be manual only.
That doesn’t worry me as I entered all my movie collections manually but may be a concern for others.