This comes from a profound misunderstanding of SJW principles. SJWs have a 'we wuz robbed' view of the world and history. In their mind, Tolkien being loved came at the expense of a rightful love of a black ladies series of books, that should have existed. LotR's is a USERPER from the rightful way history should have been.
But this is Bezos' project, he wanted his GoT for Amazon.
And I sincerely doubt he is SJW. Sure progressive and cult of Mammon, but that's it. And it was in his power to choose directors, screenwriters, veto actors, and so on.
Spending that kind of money on something that out of gate snubs millions and millions of fans lets me know agenda first, business a distant second.
It's about Bezos vanity, and last years show that streaming consoomers gonna consoom just anything.
You could have black Eastern dwarves by casting black albino actors, which would also provide albino representation and jobs for black albinos. And honestly I doubt people would complain if there were Asian and African featured elves living in the South and East. Maybe they always looked like that, maybe they're half-elves who inherited the looks of their human ancestors. You could even have anti-white racism coming from these non-white elves who use the whole "white elves were a beta test, non-white humans are God's final plan" as a rationale for their racism.
I'd say it that way - elves as race are clearly described in general description as having light skin. Avari and Sylvan elves are different cultures but not subraces - they came from the same original three race - First, Second and Third as Eldars. The darkest any elf is described is probably Caranthir the Dark, who is described as ruddy faced. Now Avari could possible mix with Men in other parts of Middle Earth, but the point is - in average situation half-elves are Men. Sure elvish ancestry can do something - Imrahil of Dol Amroth was noted as having elven look many generations after his elven ancestress but his fate was Mannish. So was with Dior Half-Elf, son of Luthien and Beren, he would live as mortal if not slain young. Earendil and Elwinga and their children get choice as very very special ocassion that in no way touched other half-elves who are truly mortal.
So elf failed right away. If anything considering action happens in Southlands it would have more sense to cast this Persian chick as Elven, and him as man.
About dwarves - I'd say they are basically earth elementals forged by God-Smith in his forge. Them having qualities of stone and metal, could be cool. But still a) dwarven women are for men and elves almost identical with men. So best pick would be to hire men to play dwarves of any gender really. That also means Disa should get at least big big beard, and manly clothes. b) ok I can get dwarves with skin like bronze and brass. But there need to be some sense of common look, not each dwarf for his own.
Now of course Dwarves were also tragically visualised in Jackson movies - with Gimli being straight from Warhammer Fantasy, and Hobbit dwarves being bunch of average lankyy handsome actors that you had to blink to notice they are dwarves, and those made to look more dwarvish look like Warhammer Fantasy but even less serious - bearded caricatures of fairy tales dwarfs mixed with chavs. So I'm gonna say - of course casting like that is bad, and her characterisation is bad. But if they gonna play Khazad Dum as this svartalfar magical kingdom mixed with Phoenician, HYebrew and Akkadian vibe rather than Warhammer/D&D funny drunken dwarves - I'm gonna forgive them multiracial dwarves. Really. Fingers to my heart.
So people seems to center on black dwarvess, but really it's elves that worrying me. Black silvan elf in some ridiculous wooden armour for one.
For other - Galadriel as warrior princess who took role of Gil-Galad and Elrond as those who first sniffed Sauron's evil plans, and Elrond as effeminated "politician" rather than herold and marshall of Gil-Galad, and general of northern armies.