Didn't Lucas originally imagine lightsabers or more importantly the weapon that a Jedi wields as requiring an immense amount of focus to use as they were supposedly made of a dense energy. Hence Jedi were the only ones who could weild them and why they often used a two handed grip, because they were heavy, and they'd use short precise strikes as not to waste energy fighting.

I don't even know if that make any sense (a dense energy?) but my memory of this is fuzzy. If anyone knows what the hell I'm talking about please add some input.