Sorry, but that's like saying that nobody cares about Gandalf the white in LOTR, and you can cast whoever you like for the role and make his robe rainbow colored.

In fact Amazon didn't do that, the actor playing Gandalf in Rings of power is a white man. For obvious reasons, that have nothing to do with being against diversity.

The blue fairy has a central role in Pinocchio and she has long blue hair.

They knew that casting a shaved woman would be much more than simply adapting a story. it's like if in a Nausicaa in the valley of the winds adaption Nausicaa is a black disabled boy. It would simply not be the right choice, casting as a job is exactly that, choosing the more apt person for the role, which includes appearances.

Of course the colour of the skin is not a fundamental trait, unless it is in the story.

A white Apollo Creed would be highly controversial, like a black Abraham Lincoln, an Asian Sitting Bull or an Italian Malcolm X that only eats spaghetti and says "mamamia" with the hands.