For a series that prides itself on diversity and a wide range of alien races/worlds, there seems to be a distinct lack of world-building in the shows by TPTB. Besides there being little about variations in skin colour and other superficial changes in races, there also seems to be a limit on religions per species. (Most likely due to budget and time and blah, I do realise this)
Is it really reasonable the the entirety of Vulcan follows the teaching of Surak besides the V'tosh Ka'tur? And that the only two religions on Bajor are those who worship the Prophets and those who worship the Pah-Wraiths? Considering that there are about 4200 religions on Earth alone, it would stand to reason that other worlds would have a hell of a lot more than two - we just haven't seen them.
So I imagine it's the same with different ethnicity in different races: they'll be there and there'll be a perfectly good explanation, the world-building just hasn't gone that far. Along with black Vulcans (which logically would make sense being as it's a desert planet), there could also be Andorians that are purple or have differently-places antennae.
TLDR; each alien species we see probably has a wide range of ethnicities all their own, the TV world-building just hasn't gone that far. The books probably have. So a black/oriental/whatever Vulcan shouldn't be unexpected.
Is it really reasonable the the entirety of Vulcan follows the teaching of Surak besides the V'tosh Ka'tur? And that the only two religions on Bajor are those who worship the Prophets and those who worship the Pah-Wraiths? Considering that there are about 4200 religions on Earth alone, it would stand to reason that other worlds would have a hell of a lot more than two - we just haven't seen them.
So I imagine it's the same with different ethnicity in different races: they'll be there and there'll be a perfectly good explanation, the world-building just hasn't gone that far. Along with black Vulcans (which logically would make sense being as it's a desert planet), there could also be Andorians that are purple or have differently-places antennae.
TLDR; each alien species we see probably has a wide range of ethnicities all their own, the TV world-building just hasn't gone that far. The books probably have. So a black/oriental/whatever Vulcan shouldn't be unexpected.