Tolkien's Elves and Dwarves were NEVER black, why should they be black now?
Lack of creativity is part of the problem, these writers and showrunners just can't be bothered CREATING a new IP, they always want to leech off of existing ones, but they also want to cater to the new demographics, and this is where the thorny issue of "diversity in existing characters and species when little or none existed before" rears its ugly head.
Aside from that, the writing is bloody awful in this show.
Dumbasses are trying to twist themselves into knots to come up with any sort of explanation for why Elves could be black. I've even seen them resort to saying "he called them fair, that doesn't necessarily mean fair skinned". And I guarantee these are the same people who used to call Tolkien a white supremacist and that orcs were stand ins for black people.
They also excuse the black Hobbits by saying "he called them browner of skin", completely ignoring every European ethnicity who are browner of skin than the average English person.