I don’t agree with the reading that Obi-Wan and Yoda were just using Luke, but I don’t think TLJ ruins that which came before it. I know it’s kind of a paradox, but TLJ is both dependent on the the OT, while also trying to be its own thing. It takes the franchise in a different direction for sure, and you kind of have to separate it from the thematic heart of the originals.
It’s not an exact comparison, but think Logan relative to the original X-Men trilogy.
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That being said, TLJ isn’t really as gray or cynical as people are making it out to be. I don’t think it was saying the Jedi are evil.
I think it’s still a very traditional good vs evil story, it just places less faith in ideals alone and gives less credit to principles making a hero. It embraces the human condition and makes that which is in all of us - our ability to fail and move on - good enough to be heroes. In some ways, that’s more optimistic than saying we have to work super hard just to be good people. It’s not saying that the Jedi were super bad just because they were flawed, just that they don’t have a patent on being able to save the galaxy.
Sometimes trying too hard to be the hero can backfire, like with Poe, Finn, and Rose - and in the case of Luke, who held himself to such high expectations of heroism that he exiled himself after failure (which, thinking the galaxy is better off without you is still kind of an extension of some bullshit hero complex).
You don’t have to try to be the hero - as long as you do good, there’s one in there - and your failures, flaws, and screw ups won’t take that away as long as you get back up.
EDIT: honestly I wish people wouldn’t ignore my posts
I definitely don’t think it’s cynical at all, in fact it’s openly critical of cynicism. I do think it’s grayer than any Star War before it, though mostly in the ways it shows that being good is complicated.
People say that this film make out the Jedi to be evil. I don’t think they make them out to even be bad. Just imperfect.