I've said it before and I'll say it again, the only thing that should be revamped is Coils of Bahamut.

It's just Solo/Un-Sync fodder at this point but has some of the greatest of the boss fights/music/ and lore.

It feels like a very important part of the story that I feel a good majority of players don't know exist because of the lack of being able to simply queue for it.