what people skip over is that it isn't about a black character being there or not.
it is about what it tells you about how the framework for roleplaying is being set up
when you insert modern diversity/norms/sensibilities into a medieval setting it also comes with the modern values
the goal is no longer letting you roleplay Krudinger Arschloch, empire veteran and worshiper of Ulrich. Because he could be mean to halflings and that might upset someone somewhere. So they want you to play normy mcmodernface, social media veteran and worshiper of the current day because it's safe and won't upset anyone.
It takes the immersion in an other world and the emotion it brings with it out of the game. All it leaves is a husk where you roll a dice to play it and you can throw in a pun now and again.
there is no role play just a costume you put on while still being you