I’ve read that East Asians developed slanted eyes or Epicanthic Folds as a way to adapt to snow blindness in the more snowy and colder regions of Asia, and I was wondering why Northern Europeans, specifically Germanic and Nordic people that lived in the colder regions of Northern Europe, didn’t develop the same genetic trait or at least something similar to it.
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Evolution takes random paths that may or may not lead to useful features. We have the power of hindsight to guess which conditions might have led to a feature, but there is not telling which features will appear. Your question can be generalized to why don’t all animals fly or why don’t all animals run very fast. It may be the case that no others had the mutations that led to folds or some had mutations but that did not give them enough survival fitness to propogate their genes
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