Honestly, I still think people over exaggerate Luke in TLJ. He was broken due to realizing the hard way that the path of the Jedi only leads to more death (we're talking about the movie Jedi, who were political bodyguards who can't stand emotions with some who are somewhat "human," not the Legends Jedi who were the ideal heroes), and needed to see that there is another way, with the help of Ray and Yoda. And to me, that's like when Obi-wan needed Luke to prove to him that Anakin can still be saved, only Luke was still alive and died doing a Force power we never saw in the movies until than to save his pupil and friends.
Yes there needed be another way for the Jedi than what Prequel Jedi were and that was supposed to be what Luke’s New Order was supposed to be.
This is what the problem is we don’t know what Luke’s Jedi Order was like because neither director gave a shit about how that should be depicted.
The Last Jedi wants to be a critique on Jedi as seen in the Prequels but to do that they had to make Luke the stand in for it instead.
I just cannot understand the thought process of "I thought about killing my nephew and he caught me almost doing it and fell to the Dark Side so the Jedi as a whole are all failures." That seems like some leaps in logic.
And no matter what anyone ever says or tries to explain it I will never ever not think that whole killing Ben think (it doesn’t matter how brief and felting it was) as anything but contrived and out of character if they wanted Luke to have some big failure that left Luke a broken sad old man fine but that was not the way to do it.