One thing I want to point out here, you can explain dragons with magic or even physics (e.g. a world having less g). You can't explain podunk villages that see a couple of outside peddlers a year containing the demographics of Brooklyn with population genetics. 
https://twitter.com/RichardHanania/status/1566795172322480129
You could in principle maintain world plausibility by arbitrarily making a certain fantasy race (dwarves?) or ethnicity (Seanchan?) uniformly Black. But that's now what USian fantasy shows do, they instead randomly make every 3rd/4th character Black. akarlin.com/review-wheel-o…
They are not portraying caste societies in which intermarriage constraints can maintain strong phenotypical differentiation for centuries or millennia, nor is any magical explanation for this offered. So this just results in making it impossible for viewers to suspend disbelief.
Note: There are some fantasy societies in which a modest degree of diversity is defensible from lore & logic. Cosmopolitan organizations such as Aes Sedai or Whitecloaks who draw from all across the Wetlands, for instance. Major capitals. But not villages or small mining towns.
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