Ah, but they changed all of that in Voyager with the 29th Century technology.
Here's an easy cop out: Earth focuses more on computer technology rather than biotech after this, and as a result the whole Eugenics War was delayed.
As for making a movie with no established Trek characters, I can't say I like the idea at the moment. I wish they would just make it after Enterprise concludes and use their cast in the movie.
In the meanwhile, are they ever going to let us know what happened to the Voyager crew? It still burns me up that they ended right after getting home instead of getting home in the second to last episode, and then spending the two-hour finale on the aftermath. But I digress..