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If I remember correctly, one of the main in-universe reasons that lightsabers are really only used by Jedi is because they're so freaking hard to make. You have to get certain crystals that are only found on certain planets, put the circuitry together just right so you don't end up with it exploding in your face, etc. That's why Darth Vader was impressed that Luke was able to make one on his own.
That, and you'd have to have supernatural abilities to be all that useful with them in a battle where everyone else has laser guns (although considering that blaster bolts don't seem to go much faster than a little league pitcher's fastball, that's kind of debatable)
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