The problem isn't just an aversion to anything that didn't happen in the original, though - you're kind of glossing over the more relevant point. Candor's post is absolutely spot-on; introducing a retcon for absolutely no narrative benefit besides over-complication for the sake of it is a major storytelling pitfall. (& as a metal gear fan i'm intimately familiar with it :II) Even putting aside all the stuff that makes Genesis such an obnoxious and trite character, his inclusion is just plain redundant and unnecessary, which is a thing that's endemic to the extended universe style of writing in general.
It's kind of telling that even a lot of the people who really like Crisis Core's story tend to say stuff like, "yea it was surprisingly good whenever Genesis wasn't on screen"
It's kind of telling that even a lot of the people who really like Crisis Core's story tend to say stuff like, "yea it was surprisingly good whenever Genesis wasn't on screen"