I don't like mixing fantasy with my sci-fi, unless it's vital to the plot. Yes, I know things like FTL and such are basically fantasy in different clothes. I'm OK with the Force in Star Wars, because Star Wars almost entirely about the conflict between the Jedi and Sith. I quite like White Wolf's Trinity RPG (and eagerly await Onyx Path's forthcoming edition), because the game is entirely about psions.
But it seems like Traveller just tosses psychic powers in because it's expected. "Yeah, yeah, lasers, FTL, power armor, psychic stuff." The more pretense at realism a particular work of space opera makes, the more out-of-place psychic powers seem to me. For all the care that Traveller seems to take regarding its technology, sociology, economics, etc., it just makes psions and psionics stick out like sore thumbs... growing out of somebody's forehead.
But it seems like Traveller just tosses psychic powers in because it's expected. "Yeah, yeah, lasers, FTL, power armor, psychic stuff." The more pretense at realism a particular work of space opera makes, the more out-of-place psychic powers seem to me. For all the care that Traveller seems to take regarding its technology, sociology, economics, etc., it just makes psions and psionics stick out like sore thumbs... growing out of somebody's forehead.