If you could revert spec/class changes to a different expansion which would you chose?

Me personally, I’ve been watching videos on warlocks, especially affliction from MOP patch 5.4. Looks like a lot of fun, especially malefic grasp. Not sure why they pruned a lot of those abilities away. Where is Soul Swap, old soulburn (made seed of corruption actually useful). Which class/spec would you change/add from past expansions?

I would easily bring back Monks as they were in MoP.
Since I mainly play DPS, Windwalker Monks to be specific.

Vanilla had better talents/skills.
Since then it’s all been downhill.