Why is it in every -blam!-ing Star Wars movie someone loses a hand. Like think about it. Starting with Obi-Wan chopping off that arm in episode 4. To Luke in episode 5 and Anakin in episode 2. So many people lose their arms and hand in these movies. Why?
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Well, according to the non cannon expanded universe, to use the force at its fullest a force user must have all his body parts. If you lose your leg or arm, you cannot use the force at the same extent. That why Darth Vader could not become a true Sith lord, even though he have the title of Darth.