The Jedi are childless weirdos and TLJ should have been about that.

Firstly I'd like to say there's nothing wrong with being childless or a weirdo, but there's a reason neither is the normal position.  Most people form good relationships by NOT being these.

I have been reading and listening to people talk about "The Last Jedi" the latest Star Wars flick.  In it there is a lot of talk about learning from failure, and absolutely no actual learning from failure.  For instance Yoda says that she has all the wisdom in the old books, not telling Luke that's because she has the books. Those would be the books that have the Jedi "wisdom" that is part of why they failed in the first place.  Luke is the only one who actually managed to beat the Sith, but he teaches her almost nothing because he failed and he's depressed.  So what should he have taught her?

Well he should have pointed out that the Sith were beaten by people with good relationships because they had good relationships. The Sith were bitter, angry, obsessive freaks with power, and so they stuffed up every relationship they ever had.  They were able to manipulate people but not handle a genuine relationship.  The only people worse at relationships were the Jedi, so don't listen to them about beating the Sith.  When a man talks about how he keeps getting prophetic dreams about his loved ones dying you don't tell him death is great and you should be glad when it happens.  Palapatine didn't win Anarkin's loyalty, the Jedi lost it.

A good argument could be made that Luke, not Anarkin brought balance to the force.  He went full berserker homicide mode on his dad and didn't fall to the dark side.  He brought himself back from being absolutely full of hate, something the Jedi can't really do.  Could he have done this if he had abandoned his friends who were suffering because of him?   I don't know but probably not.  Luke is about hope and loyalty, and not going to his friends would have split his soul in a critical way.  Long story short, following Yoda's advice would have got Luke and possibly even Leia turned to the dark side.  Against the dark side you really need to know who you are, "I am a Jedi like my father before me.".  Bear in mind that Luke barely came back from the dark side as it is.  Without his friends...

But Luke forgets that's how he won.  He listens to Yoda.  Why?  Yoda is the old thinking that got the Jedi defeated.  Luke is the new thinking that destroyed the Sith (or at least those Sith that were visible).TLJ should have been about the power of normal relationships that aren't based on monkish obsession.  But SJWs hate normal relationships so that was never going to happen.