In a universe with endgame technology, why would anyone use melee weapons like lightsabers? Every time I try to imagine a character using such a weapon, the thought always occurs "why not fire this from a gun?" Especially when characters can be modified to have flawless accuracy. And how would a human or alien even stand a chance against machines with more intelligence and designed specifically for killing? Or do you just have to ignore these things and pretend purity of heart is the real key to victory?