Back to the OP, I think the Wars galaxy (did they ever bother to name it? beyond gffa, I mean) would benefit imensely in any point in the timeline that Palpetine isn't in charge.
Trek seems to do a better job of keeping their psionics from going on galaxy conquoring sprees every few decades. Something about the social framework Vulcan or Betazed have going on must be working. Maybe it's just the higher number of psionics in general. When you're one in ten trillion, it's a lot easier to get full of yourself than when you're one in three.
I think the main reason that Betazeds and Vulcans do not go on a galaxy conquering sprees has more to do with the fact that they do not have anywhere near the power that force-users have in Star Wars do.