I don't give a flying fart if there's a black actor playing an elf. What I would like to know, however, is if he's playing a white elf or if he looks to the other characters the same way he looks to the audience.
Like, in the olden days all the actors were men, so female parts were played by a guy. The other characters, however, saw a woman. They played their parts as if the dude playing Lady MacBeth or Juliette was a female. The audience sees a man while the characters see a woman.
...
It's just a thing that appears to be purposely injected by the writers to serve as a distraction and a buffer against criticism.