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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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
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.