Bedrockgames
I post in the voice of Christopher Walken
So it can sometimes be rather glaring when an entire species is a play on a single racial or cultural trope. Especially when by comparison, the typical primary player race (humans) has been shown at length to have cultural, racial and physical (at least superficial) diversity both in the game material and in the settings themselves (exampled by having multiple different human civilizations with different cultures and sometimes physical appearances).
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I think the tendency toward monocultures is just to make them easier to use in the setting (and possibly easier to handle in the design phase too). But I don't think monoculture races are as ubiquitous as they once were.
In terms of the orcs being a stand in for one racial group. I think it isn't just one racial trope being put into orcs here. Obviously most of the cultural features of anything in a fantasy setting will have some basis in reality. Orcs support a lot of different kinds of cultures. Some orcs I've encountered in games seem vaguely Mongolian in culture, but I've just as frequently seen orcs that are more like vikings or celts. And the visual depiction varies a lot too. I just don't think it is that crazy for most people to see an orc and not see the racial or historical issues people are invoking.
I think it is also important for us to keep in mind, drawing on a real world culture to paint something vividly in a gaming context, doesn't automatically mean it is a commentary. And again, I think this is where we are starting to get a led a bit astray by completely throwing out authorial intent, and saying only our reactions to the stuff matters. If someone is drawing on a cultural feature because it is aesthetically interesting for the group being described in the setting, should they limit themselves to only elements that can be perceived as a positive or neutral? Is it okay to have 'warlike' anything in a setting or is that too problematic. Or can only certain things be warlike? And it feels like a lot of what is being called for would almost naturally lead to a colonialist setting (because everything is being framed in terms of colonialism, so it becomes a matter of just making sure our settings are morally appropriate commentaries on colonialism----it will still be playing out the colonialist tropes, just with our sympathies weighted toward the colonized. But i think few gamers actually have colonialism in mind at all when they sit down to play a fantasy gaming setting.