Luke should have fought against Kylo Ren in person and his confrontation with the walkers should end like Dark Empire(size matters not…). He never, never should have abandoned the jedi order, that’s not Luke.
I often wonder if, had the PT come first and the OT came out decades later and the scripts were all more or less the same, people would say this exact thing about Obi-Wan and Yoda in the OT.
“They never would have given up and gone into hiding! That’s not Obi-Wan/Yoda!”
Hell, I was saying that the first time I saw ROTS. It makes no sense for Obi-wan and Yoda to just give up when Obi-wan (explicitly stated as being the weaker of the two) defeated Anakin at the height of his power in a one-on-one battle. Just fight him again, or team up with Yoda and finish it, then team up and defeat the Emperor.
Luke in TLJ is handled a lot better since he was never raised in the Jedi ways and defeated the Emperor by going against the advice of his masters. It makes a lot of sense then that he would refuse to rebuild their flawed order. No, the biggest problem with Luke in the ST is not that he abandoned the Jedi, it’s that he abandoned his friends. No amount of offscreen flashback trauma should change the absolute core of his character, period.