Sadly, we all know that blizzard left the path of bc when there really was player's raid progression through all tiers even at the end of bc. It's a shame that they waste so much created content only for new players to be able to jump straight into the highest raid tier cause "everyone should experience everything in wow WITH NO FUCKING EFFORT".
Everyone CAN experience everything in wow, only difference in vanilla and bc was that people actually had to aquire some skill and spend some time at their hobby no. 1 to enjoy it.
I would LOVE to see that come back cause i hate the whole "farming heroics for badges for full epic gear in 2 days" concept that exists now.
Blue dungeon sets that take some time to get replaced by raiding gear would be perfect, divided in all the armor classes and specs that were already mentioned in this thread.
And yes, I QQ about wotlk being easy with my BIG pink nostalgia glasses on