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The reason prosthetics are so good in Star Wars is because the Jedi use live lightsabers to train.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
We have been shown that there is some weight to a lightsaber when lit though. Like in Rebels and the Mandalorian/Book of Boba.
And this weight is different to how a normal sword would work. The length adjustment is to finetune this power/weight distribution to fit the user and their style of fighting. Which is why we get shotos and claymores, as well as different sizes for different sized species.