I honestly have better things to do with my life than worry about some online "culture war". I just abhor hypocrisy and much prefer honesty. So when people complain about too many black people in a fantasy show I would prefer they are honest about why it bothers them instead of hiding behind "authenticity" or some other bullshit.
At least have the courage of your convictions.
Secondly, Hollywood has ALWAYS changed the races of historical characters, it's not like they have started doing this in the last decade. That's how you can have John Wayne playing Genghis Khan or say Elizabeth Taylor playing Cleopatra.
On the subject of Cleopatra, the black community has claimed her as well, but it makes no sense either.
She was Macedonian Greek which makes it very likely she was Mediterranean in appearance.
But I digress, the reality remains that race-switching characters is almost as old as Hollywood itself.
The only thing that has happened more recently is that whereas this was primarily white actors playing non-white characters in the past, we now occasionally also have a non-white actor playing a white character.