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The reason prosthetics are so good in Star Wars is because the Jedi use live lightsabers to train.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Maybe the length of the saber doesn't scale linearly. Maybe there's some extremely fast dropoff in effectiveness after a couple of feet.
And the power limitations of the phasers seem to me like they require some kind of capacitor to charge up and release in a burst. Plus maybe the tip of the phaser would overheat under sustained fire.
And sure, you could say "add more tips", but we've tried that with gun barrels IRL for the same reason. They're heavy & unwieldy so they only get used for mounted guns, like with the minigun.
And star wars has miniguns as well to solve that problem, usually carried by a single heavy gunner
RIP Hevy