Except elves and dwarves, who as far as we know always existed. And trees, and rocks, and animals, and dirt, and fire, and water, and air. There's certainly no lore justification given for the existence of white humans in the vast majority of "story-driven experiences". We just take it for granted that the honky is the default dominant species in pretty much every fantasy world. Even if there is "lore justification" for it, it's either ridiculously flimsy (like, let's face it, all lore justification is) or the audience isn't actually privy to it, so it's irrelevant.
This is where I call bullshit on your argument here, at the beginning, to show how from the base up, your argument was flimsy and doesn't hold up.
We have lore explanations of elves and dwarves, from their own peoples beliefs at least. The elves and dwarves have a diverse and rich culture about them that has been made clear from the get go, and even has been a massive driving point in the games. Why don't we see a lot of dwarves on the surface? Cause they view leaving underground as akin to being worth less then the lowest scum in their city-state, and so wouldn't want to leave for fear of social repercussions. Why don't the elves have a kingdom of their own? Because they declared war on the dominant religion of the continent and payed the price when the others of the faith retaliated.
There are depths of lore that play into these races, none of them were just plopped out of no where with no backstory and nothing interesting about them, or if their origins are mysterious, that is given credence in lore and because a driving factor in the lore on their race. Which is where humans come into play.
The humans supposedly arrived to the country at some unknown point from some unknown place, supposedly. They set up an empire in the far north, that stretched the span of the continent, then collapsed under the weight of a religious based revolt. What we do know though, is that these countries have all had established facts about them that make them unique, geographically, culturally, and in terms of physical appearance. We know those of the west tend to be of a darker and more Mediterranean-esque both in culture and appearance, given the spanish and italian influences that went into rivian and antiva respectively. We know those to the south are lighter and fairer then those to the west, or the north, which is lighter still then the west. More importantly however as skin color doesn't define a character, each of these places have their own cultures, which play heavily into the setting and the lore. Nationalism is alive and well in dragon age, and as a by product, in how people precieve races accorss thedas.
So claiming that because people want an asian culture as well as asain race included, instead of just asian looking people in game, is an excuse for racism, is completely absurd. What you are demanding in your rushed job option, is actually more racially insensitive then what your opponents call for. You are saying that asains matter so little, that you can just slap a few european based npcs with skin tone and facial features, and call it a day, instead of giving asains a full dragon age worthy experience. You're calling for short changing them, and snapping at everyone who doesn't fall in line to your crazed demands.