They did not want to rehash Star Wars, or Luke would have been physically on Crait and would have let Kylo strike him down so Leia and the rebels could escape the way Obi Wan let Vader cut him down on the death star.

They sort of did it but with Luke as a force projection instead so Rian could say it was original. And so Broom boy got his legend.

And Luke being a cranky old man was a bit like Yoda on Ach-to. I’m surprised no one else noticed the parallels along with that dark cave being like the tree on Dagobah.

Except in Yoda’s case he was testing Luke, in Luke’s case he wasn’t testing Rey he went there to die and meant to burn it all down. The Jedi the hope for the galaxy, burn it all with that tree and the jedi texts. And teach no one.