TOS shows us that he had little use for people that don't join his cause.
Yep. When Khan had little use for the remaining three quarters of world who would not accept his rule, he.... got attacked by them four years later.
I'm not trying to argue that Khan was a saint. He was a very ambitious and dangerous individual. All I'm saying is that he was more than just a bad guy who wanted to kill people. The part of him that wanted to rule, build an empire, win a world. The STID writing trio didn't seem to think so. Being the most recognized villain in Star Trek, they pretty much decided to solidify that he was just a bad guy who just wants to kill people. They act it out and even spell it out.
When I look at Space Seed, I don't see that. Heck, even when I look at TWOK, his eventual demise is still tragic in and of itself because we'll never know what kind of a world Khan would have helped build. And since these movies are now action movies, I don't think the team have any desire to pursue stories like that. And if you like your direction, that's fine. Just don't tell me that NuKhan is exactly the same as the original. Not in terms of race, ethnic groups or skin color, but character.