Uh ... I think we'll have to agree to disagree on whether it's relevant? (See below.) There's potential there for going in circles.
You're actually right to remind me that an ancient Egyptian Fantomah wouldn't be ethnically black-as-we-understand-it-now, but she would be a person of color. Whitewashing is not a phenomenon exclusive to black characters -- the current Avatar: The Last Airbender controversy is a really good example of this. (If you're not aware, the summary: pseudo-Asian (rather than the usual pseudo-European) high fantasy cartoon is being made into a movie ... but with all the main characters except the bad guy cast as white.)
As to the hair -- hair color can't be interpreted without being put in context. In comics, white hair on a young person with no other visual cues means they're extremely (platinum or peroxide) blonde, not that they're ill: Felicia Hardy/Black Cat or Tandy Bowen/Cloak are good examples of this. As for black hair, I don't believe I ever said it was considered a bad thing, but all of your examples are black hair on white people. I'm talking about the specific implications and political significance of giving a female character of color white (read: blonde) hair rather than brown or black, when black women and other women of color are being constantly blasted by images in the media and by social pressure suggesting that having hair like a white person's is better than whatever they have naturally. In other words, it is really not cool.
As to your third point, I disagree, because I don't think a character of color's design can be removed from political context, whereas a rebooted character's design has no consequences other than the (un)happiness of fans; their being a PoC matters more than their being a white character's reboot.
I wasn't accusing you of using strawmen by making up arguments out of whole cloth -- I was suggesting that you were oversimplifying and taking people's words out of context. Which, well, you were. As for your artist's dystopia of blandified creators terrorized by the specter of false accusations, this is another old, old strawman. Four points for you to think on. 1) Promoting awareness of history and racial sensitivity is not stifling art, and genuinely bold artists are bold enough to handle criticism. 2) An artist who depicts characters of color blandly in an attempt to avoid criticism on grounds of being racist is much more of a racist than someone who attempts to face racial issues head-on and makes a few mistakes. Most people realize this. 3) It is more than possible to discern between different racist offenses, their reasons and context, and things which are not racist without cutting anyone slack. 4) Not all artists are white.