Some bands and artists post commentary versions of their songs/albums which is fine for those that are interested. But it makes for a bad listening experience if I just want to shuffle an artist's song list and a bunch of commentary versions come up. Having to create a Playlist with everything but the commentary versions seems like an awkward workaround because most times I don't want that as a playlist…
Some example artists are "Avett Brothers" and "Jack Johnson".
Another usecase would be when an artist has multiple versions of a song (if a band has a "Best of…" album for example). It'd be good if you could just disable any "duplicates" and just have the version you like most play in the cycle. I used to do this with iTunes.
I understand there has to be a reason for this. There was a similar idea posted which is now closed but I still think something like this is worth considering. I hope this provides a little more context to why it's valuable.