I don't see it as tainting, per se, I just see it as beyond the scope of the atmosphere I'm trying to craft. I'd never give names to different human factions, for instance, as I think that spoils it to a degree. A lot of people pretend to be Ender, or part of Battlestar Gallactica, or something else that they just kind of create on the fly in their head. My favorite 8-bit games were like that, too, and I think that's missing in modern games. But by all means, fan fiction is welcome.