I believe we're talking about influence.
But to advance your point, TES hasn't exactly been consistant with any of the races, ever.
Voices of dark elves have always changed (most noticibly). Types of Argonians and Khajiits have never been consistant. Khajiits were just normal people with cat genes or something in Daggerfall. So yeah, Beth pretty much just does whatever they feel like. No logic behind it.
I know but demanding a black person to do a black character voice in a fantasy game is beyond me since is a FANTASY game.
That's like putting a race with Asian characteristics and using a Caribbean voice, would it be weird? yes but that's the point, in that universe there is no Asian people nor Caribbean, that race mix those characteristics to create a character in a fake universe.
Not trying to go against your point just saying that the point of fantasy games is that, fantasy; otherwise we better start putting real races in the game.