Didn't want to add to the natter, but I just a thought about lightsaber fighting — the blade is made of energy, right? So the only part of the weapon that has any weight to it is the handle. Is it possible that the decreased weight / balance / whatever would alter the way you fought with a weapon like that? It strikes me you could do a lot of moves quicker if 80% of your weapon doesn't weigh anything, so it would lead to a fighting style with a lot of quick attacks and the opportunity for flashy moves that would look a lot like flynning. Sort of an in-universe justified trope, I guess?

Is the Princess Bride epic sword fight at all realistic? I'm not an expert but it doesn't appear as flashy as most flynning examples, though the end result is pretty similar.