To be fair all of those scenarios also exist with non-classical music - tribute albums with various artists, covers albums by one artist, albums where guest artists perform with the main songwriter, etc.
I mean, try filtering for all songs written by Burt Bacharach or Irving Berlin in your collection, for example - currently can’t be done in Plex. Or all songs produced/remixed by a certain producer.
Classical music does have some unique characteristics in things like the Work/Movement naming convention, and Conductor.