I honestly don't see an issue here, if you are good enough to be selected for the voice cast and you do a good job of it, that's fair.
If the playing fields are equal, sure. But they aren't. And probably never will be. Minorities have a much tougher time getting roles and representation in entertainment fields. So if a developer is going to go out of their way to create a minority voice, to add that diversity (and check off that PR box, lets be real) to their game, give the role and the opportunity to a minority. Do your really think almost every damn role goes to a white person because they are the "best for the job"?