Not sure if it was about fantasy or OPness.
Warriors remember foundly of MoP, but they also started being disgustingly OP in PvP and fury was S tier in raids for a big chunck of MoP.
Warlocks were strong in pvp and so OP in raid that blizzard even admited, they couldn’t nerf them. Otherwise, many guild would now be unable to kill boss they were previously farming.