Simple thing which I believe is an oversight from Blizzard.
Colored Class Nameplates were a thing back in original Wrath, and I don’t see a reason why they would not implement it again. No reason to have an addon for UI upgrade that already existed back then.
Other things which were later added to the game, such as raid style group, were implemented in classic, so why is this not in?
Also the item level of items!