If I save an album, I used to put it in a playlist. But it shows the album twice, within the recently played.
To me, that would only leave things cluttered. So I deleted the playlists to albums I saved for offline listening.
And the only playlists I create, is from the music I purchased, to keep it separate from non purchased music.
I don’t really know how I want to sort my music so I can keep track of what I save, but eventually I will find a system.
With that said, I have 15 playlists. Two of which are my own mix of music from songs I purchased.
Not counting the curated playlists, that are automatically put into a playlist.