Quote Originally Posted by diamondedge83 View Post
It's definitely all aesthetic and if/when there is lore for the colors, it comes later as a means to fill in the cracks so to speak. There's no reason Rogue Squadron's X-Wing has to have red lasers while the Galactic Empire's TIE-Fighter has green lasers, other than George Lucas wanted people to know who's good and bad at a distance.
This is probably all there is to it, yeah. It might become a thing retroactively but yes. The purple of S9 does reinforce the lightning nature of how we understand their society to be, but it also makes it clear to us that they aren't necessarily just Allagans. If they were that blue color no one would really doubt it I feel.