Again, there's a lore basis for Warlocks to be able to perform metamorphosis. There's no lore basis for them being capable of piloting mechs, or for piloting mechs to be a wide-spread practice among non-Goblins and non-Gnomes on Azeroth.
Where? I'm not aware of any Warlock lore figure ever piloting a mech.Then so is the class piloting mechs.
According to this the total Monk population at level 110 is within 1-2% of the vast majority of WoW classes. I wouldn't say that's a "few" people.No, they don't. Again, a class can have all the coolest, flashiest abilities, but if the gameplay isn't interesting, the class won't stick with the player. I only mentioned the druid because it was my own example. Let's take a look at the monk, then: they have several 'flashy', 'cool' abilities, yet few people find its gameplay interesting.