Vulcans and Romulans have basically the same look (in TOS they were distinguished largely by the Romulans distinctive garb and the fact that Ronulans were only encountered on Romulan ships, in TNG and later shows the Romulans often had ridges, but not all individuals did.)
That they looked identical (except for the ridged Romulans) because of their shared origin was a quite important point from their introduction.
Some of them do. But mostly they look like aliens and any attempt to contextual is it as a race thing is about as poorly warranted as the Heredity link that you were (reasonably) shitting on.
And yet the bias towards an end of the spectrum in skintones for the villains is still overwhelmingly there in the choices made by the costuming and makeup departments.
> And yet the bias towards an end of the spectrum in skintones for the villains is still overwhelmingly there in the choices made by the costuming and makeup departments.
The range and distribution of coloration for races that are mostly antagonistic vs those that are mostly found aligned to the protagonists, at least geo... well, astropolitically, doesn't seem that great, well, except maybe for a bias in the use of blue specifically for Federation aligned races.
(No, only Vulcans and Bajorans got that treatment...)