The prequels do show quite well the thing about the Jedi Order and its insane state - it was quite obvious Lucas wasn't trying to portray them as perfect - actually, quite far from perfect. This is pretty much the thing that was interesting in the prequels. It's just that the execution is all over the place there too. But I thought this was pretty obvious when the sequels rolled in.
Yes, I agree with that, although as you say, the execution is all over the place, so there are a lot of moments wherein this is not at all obvious. It is obvious that Lucas wanted to portray emotionless buddhist-like paragons of virtue being knights of light vs emotional wrecks full of love and rage as being Sith Lords of Darkness. It's not as obvious that he's judging this dychotomy for being stupid itself. The universe he's built clearly states that Love is something that in some cases will inevitably lead to the Dark Side. Now, I have some beliefs around this. I actually believe this kind of dychotomy comes directly from this bhuddist craze that invaded California some decades ago and is still quite strong. The fact he made Anakin to be a "Jesus Christ figure" is also of some importance, as if he's pinning christian against bhuddist thought, and the end result is the world being shattered.
What it comes to the inhibition of emotions, this is actually a very effective real world military teaching. This is portrayed in contemporary Polish history of Swedish-Finnish dragoons generally not shouting or showing pain when they received mortal wounds. Or Genghis Khan instructing his soldiers to look emotionless in the battle. No anger, not being scared. That sort of enemy appears non-human and disturbing. That's what that is all about. However, this is self-defense and combat related stuff, and should not be applied to normal life. The same stuff is also in the martial arts, you can't get angry, or you run the risk of becoming predictable.
Yes, it stems from eastern thought, as I said. The problem is that in the prequels it directly affects how Anakin is brought up, being told to bottle his feelings towards his mother and forbidden to love women, etc. So, the criticism towards the Jedi isn't about how they teach the way emotions disturb your fighting ability, but how they disturb your own life, which is incredibly wrong headed, and the way they deal with Anakin evidence 101 of this fact.
I'd also like to mention against your position that when Anakin finally gives in to the Dark Side, he basically becomes Vader and manages to kill a whole lot of Jedi Masters, only Ben besting him in the end. This when he was an emotional train wreck.
What Luke Skywalker presented was the departure of this Jedi teaching: he allowed his family and friends be more important. The ROTJ ending was about him breaking the strict conduit code of Jedi and presented significant improvement of their personal lives, making them less susceptible for the Dark Side to begin with. He didn't give up on Anakin Skywalker, and that's why I think him trying to kill Ben Solo for far less was very much out of character for Luke.
He was weak for a second. Everyone's weak for a second. Remember, at least compared to Rey, Luke has always been afraid of many things. Fear made him slightly over the edge against Ben, who then went on to take him more seriously than himself and destroyed everything he stood for. **** happens. I don't think this counts as being anti-character at all.
Oh, god, I hate McIntosh analyses, he cannot really see nuances in anything, he makes good points a minute then he proceeds to say something utterly stupid or superficial the next because everything must be either "good" or "bad" with no place for "mixed bag" or "flawed" or whatever.
I tottaly get your emotional reaction, he's specifically terrible on twitter or any other places, but I find his videos well done. Of course, they push his ideas, which are very ... ahh... lopsided, but if you view it as a "case" being done with an argument, then it goes easier on the stomach. I'm sure there are counter arguments, and counter evidences you can bring to the table. As far as I can tell, some details may be off here and there, but his overall analysis is somewhat correct. The uncaring, unfeeling Jedi Order was just too cold and too rigid to deal with someone so emotionally broken as Anakin, thus creating Darth Vader. I wish the movies were more aware of this tension and executed it better. As it stands, it just feels they were just stupid and blind to what was unfolding, like distracted parents not realising they were parenting a future mass murderer.