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R2 is a droid with that type of circuitry...Vader cant due to his prosthetic limbs. Not so much that, but mainly his life support system. I believe the emperor once said something about that when he thought vader was getting soft. Something about it being a shame to damage that delicate system, or something like that. Sids knew what he was doing when he made him, he knew he would turn on him after Padme died.
ok firstly is some video game according to wiki, he demonstrated lightning different, it came from the air instead of his hands, master Ood did a similar thing in dark empire 2.
but why bother to argue about this? he doesnt use that variation anyways, he doesnt favour lightning but favours crush and grip