I haven't watched the full replay yet but the final knock on was awful. If it had happened to my team I'd be outraged as well.
Sure, but to suggest it's the only reason they didn't win the game is ridiculous. They weren't robbed any more than the calls that were missed by the ref for the Crusaders if they had lost. Calls went both ways. There was a cleanout at a breakdown that was probably yellow card worthy at least.
I get a bit confused why you talk about Jordie Barretts temperament, which is an innate trait. He's never come across as stupid or particularly excitable but he has made playing mistakes. I don't know that his temperament has improved, he's just gotten more experienced.
It's pretty easy to forget he's only 22 - 2 years younger than Jack Goodhue and has made mistakes in the All Black jersey that the likes of Ben Smith and Goodhue made at Mitre 10 cup level.
Whatever you want to call it. (I call a mistake when you shank the ball off the side of the foot by accident or miss touch, rather than make poor decisions because you can't think clearly under pressure) He hasn't in the past coped with pressure very well. If you want to see examples of what I mean, watch last years SR semi.
There is a LOT of pressure at a RWC, and his ability to handle that (Whether it be because of his age or not) concerns me.