If human ethnicity didn't exist and function the way it does, and someone made it up as worldbuilding into some kind of tabletop RPG, people would complain that it's unrealistic because it's just too implausibly cool.
Like yeah these people have spread all around the world in all different climates so the ones from different climate types have different kinds of physical features, that are inherent and don't change when they move from region to region, so they're still going to look distinctly like their ancestors no matter where they live. Like they're all the exact same people but you can kind of tell where their ancestors lived 10 000 years ago by what sort of climate adaptation quirks they have.
And yeah no the different traits don't just get averaged out into something neutral if two people of different ancestry have kids together (which happens literally all the time btw), their kids inherit a random combination of their traits. Someone who's so black they're almost blue, with tightly curly black hair, and someone who's so white they're almost blue, with ash pale flat straight hair, can have two kids and one of them is almost white with slightly warmer amber tone and very curly type of hair, and the other can be almost as dark as the black parent but with green eyes.
And you can pretty much mix and match that shit almost any way. Like there are statistically more likely outcomes but you can literally have human people who have almost any combination of ancestral traits. It's possible for someone to look very distinctly East Asian except for having red freckles and brightly copper red wavy hair. Saw two kids exactly like that at an airport once.
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