Every country has its own cinema and represantation. But when you're about to be diverse, then I expect you to do more than increase a character's melanin.
As for the traditionalists v SJWs debate, the difference is that we're content with what already exists on the page being translated. Im not American, I don't live like these characters, I don't have the same worries as them, etc, etc, yet I still like them. Same goes for the rest of the world. We're not throwing a fit because say, Hulk isn't Italian. We just accept the characters as they are, look at their costumes and actions, and "stick" with them. Black Panther is as far removed from myself as humanly possible, but I still prefer him over Hulk, who looks exactly like me, and has a similar backstory (none of the abuse stuff thankfully).
PS: Diversity done right is say, Black Sails. The main character is revealed as gay in the second season, and the whole reason he does what he does is because "he hella gay", to put it more dramatically. People didn't rage, because the clues where there and it was a natural progression, not a stunt, like Iceman's outing. Same goes for Midnighter, etc, etc. Folks have no problem with Black Panther, a genius king with years of feats, but loathe Moon Girl, a character with less than two years of appearances, who by the moment she appeared, had Marvel announcing in every solicit and and article that she was smarter than every other character. I wonder why...
