It burns the old Jedi texts for crying out loud, as a statement that the ancient history of the Jedi is boring.
That really pissed me off as a message the film gives at that point. “History is boring, let’s burn it for a few laughs.” And coming from Yoda it didn’t suit at all. I get the idea what it was trying to make which is let’s begin with a clean slate, but you should never turn your back on history. It always teaches something. That’s like burning constitutional laws or something.
The message being that the Jedi Order was wrong: the Force shouldn’t be a dogma. It shouldn’t be teached from ancient books by secluded monks to a few selected novices, but made accessible to everyone.
Han: Hey Lando! You kept your promise, right? Not a scratch?
Lando: Well, what’s left of her isn’t scratched. All the scratched parts got knocked off along the way.
Han (exasperated): Knocked off?!