Let’s assume for a second that Blizzard has really competent and caring writers (how true is this, is a debate on itself…but bear with me):
It would be really dumb of Blizzard to create such background.
Humans in WoW have a very specific heritage and backstory, and any development they would have, would need to accommodate to not only said background but to the rest of the settings.
In terms of going down the stereotypical routes (Asian features from Fantasy Asia, and black features from Fantasy Africa), that’s a door that has been completely closed, as there is no way to reconcile such with the settings history.
Humans arrived at the EK, and it was there where they developed their cultures, kingdoms, and nations. They didn’t reach Pandaria, nor Kalimdor.
BUT, and i think its an important bit, that doesn’t prevent them from having an expanded lore regarding how they developed significant physical differences amongst each other.
I don’t want to go on a long post detailing what i would do, but to put it short i’d have for example certain features being associated with specific kingdoms.
Which again, DO NOT need to abide to any sort of stereotype you mention. Because you are right, most story tend to go down that “easy” route.
But WoW could be, and would need to be, different in said regard.
The EK is a massive continent.
And just like Dwarves developed distinct traits depending on where their clan ended up living, humans could do the exact same. Without the lazy stereotyping you mentioned.
That would basically be my proposal.
Which truth be told, would be the exact same one the Maghar, Trolls, Dwarves, Elves, and basically every other WoW race, had.
But again, all that parts from the assumption that “meta” problems such as a racist chunk of the playerbase, are to be dealt with without turning said problem into one that ultimately dictates how the story is to be written.
As someone who also followed for some time the Game of Thrones universe, I must say that i’m immensely thankful about how the book author has always opted to NOT cave in to fan demands or behaviour.
I’d say that doing such was the main reason for the pile of garbage that the last TV season turned to be.