Are you just going to change your argument every time you fail to come up with a defense for it?
Utility has been spread around, yes. Unique utility goes against game balance, though, so it's not what should be unique; playstyle is. None of the specs play exactly the same, and I would even say that Cataclysm made the specs' playstyles even more unique than before by adding more abilities and procs and such. It's no longer "I'm a rogue" "Oh, okay, they're all the same anyway", but it's "I'm a Combat rogue, I bring different utility and play differently than this Assassination rogue" "Oh, okay, you fit into our raid well even though we have a rogue already". Therefore, it is my opinion that uniqueness is in fact not being blurred, but the opposite.