Mistwell
Crusty Old Meatwad
Yes.
But D&D tends to avert that problem by the word "typically". Something like.
"Drow typically exhibit a lustrous grayish complexion that can range from glossy obsidian to silverish pallor, while bluish, purplish, and other complexions are also known."
Make sure every culture includes athletic culture, intellectual culture, arts − and criminality − and I dont expect a problem.
There can be a suggestion of ethnicity without homogenizing it, because every culture will include immigrants who are now among the ancestors in the culture.
Agreed but not the topic you're responding to.
Being able to breath under water and withstand the depths of the ocean is not cultural. You saying it's learned behavior from a particular culture is weird. It's smacking of claims to cultural superiority: as if inability to breath under water and withstand the depths of the ocean sources to being raised right, and if you're an elf who cannot do those things it's your parents fault for not teaching you the cultural traditions which would have granted such abilities.
Do you see where this is leading? It's worse than using sub-species.