All about representation
https://www.cinemablend.com/streaming-news/why-denzel-washingtons-macbeth-felt-it-was-important-to-bring-in-a-slew-of-black-actors
I'm guessing it doesn't work the other way around, does it? How often do you usually see a all black cast with whites as one of the side characters or side kicks? Since we need to represent the world we live in, correct? Even if it talks about Africa and such unless that doesn't count.