[Jazzy Boomers]

In my MobileSheets every band / line-up has a separate collection and that's it. For some songs I use the same MobileSheets-song in multiple collections (=band), for some songs I use a copied MobileSheets-song that refers to the same file, for some songs I use different MobileSheets-songs referung to different files - whatever is adequate.
For a rehearsal with one of my bands or to prepare a setlist for a band I just select the collection for that band.

Not all people are GIG...
Also, some notes or edits move when you share songs...
For some people, we sometimes have to provide a new backup...
A solution to switch between profiles would be more efficient.
And there is probably already exist a way to simply change the file path and directory location.

And many musicians collapse at the first difficulty  Restoring partial fault is difficult for people.

In addition, a multi-profile solution could help to create a "spare" tablet, witt profiles readdy to help in case of problem : Drum - Singer - Chords by example.