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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 it's a chicken and egg thing. They could've started using live lightsabers because the prosthetics are so good.