In principle I agree, but this isn't quite a comparable situation. There is no continuity aspect between the different shows you cite. Here, it's been made very clear that prior to 2233, the universe was the "prime" (TOS) one. Sure, the look of ships and technology change to suit budgets, but the people shouldn't. No one is going to switch genders. If Khan appears in this movie, he should be basically the guy we saw in Space Seed: a former middle eastern dictator who was ousted and exiled. He can't suddenly become a white British chap with an attitude to match his voice.
Nobody gives a shit what happened before 2233. Really, no one gives a shit happen happens after either. They just want to be entertained. If that means making Khan a stuff British dude, that's what's Paramount does. If it means changing him to Kambatta Persis Snooki, they do that too.