I completely agree with the idea that, with very few exceptions, making up actors of European ancestry to look like other ethnicities is offensive (the most obvious exception would be a movie about
John Griffin), so why is it suddenly acceptable (indeed, downright hip) to go the other way around?
Huh? Where is anyone making up nonwhite actors to look white? Disguising an actor as a different ethnicity is the exact opposite of changing a character's ethnicity to fit the actor. It makes no sense to equate the two.
And the reason casting more diversely is okay should be obvious: because the system has always been unfairly biased in favor of giving jobs to white actors and marginalizing everyone else. If the system tilts the scale unfairly in one direction, then pushing it further in that direction (casting white actors as nonwhite characters) worsens the unfairness, while pushing it in the other direction (casting nonwhite actors in roles that were originally white) diminishes the unfairness. It's not symmetrical. Swimming against the current is not the same thing as swimming with the current.
Bottom line, what matters are not the characters, who are imaginary, but the actors, who are real live people who need to feed their families and thus deserve equal job opportunities. Since legacy characters in popular fiction have been overwhelmingly white in the past, giving equal opportunity to actors of all ethnicities means changing some of the characters' ethnicities to fit.
And there's nothing "sudden" about it. It's been a normal practice in screen superhero adaptations for nearly two decades now -- years before Samuel L. Jackson became Nick Fury, we had Kerry Washington as Alicia Masters and Michael Clarke Duncan as Kingpin. Not only that, but it's been common in live theater for far longer. Back in high school in the '80s, my English class went to a local production of
Hamlet where King Claudius was black and Hamlet was white, and the audience was just expected to take it in stride. It's all just make-believe, after all; it's up to the audience to suspend disbelief.
Anyway, why assume that SNW's Kyle is the same person as TOS's Kyle? Maybe there are two guys with the same surname and the same job.