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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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Funny thing is that limb slicing is actually the primary goal of several lightsaber techniques, since the opponent will usually be trying to guard their vital organs and will leave the limbs relatively more exposed.
So pretty much what you would do with regular swords. Arms and to some extent legs are closer to you than the rest of the body so they are often the easiest targets.