Yeah well, if we're starting with ad hominem, I could also point out that of course you want to say we should only look at out of universe reasons, so you can uphold your ridiculous theory about Shinji repeating Gendo's story in Rebuild 2.0, because of themes, even though nothing in the actual movie, where Shinji has no idea what he's doing, points to that.
Meanwhile, the series does in fact show Shinji sinking ever deeper into depression and despair because he can't free himself of EVA.
But this claim that Shinji can't free himself from EVA and so falls deeper into despair, doesn't hold much water because for most of the series he actually gains relationships he never had before thanks to piloting EVA. He falls apart at the end because he starts making the decision to flee from those relationships.
Toji during Bardiel, where he abandons his friend in favour of doing nothing to help out of fear, and then abandoning his relationship with Kensuke out of guilt for crippling Toji.
Zeruel, where his decision to leave tokyo-3 to spite his father ends up with everyone coming within a hair's breadth of dying horribly.
Misato when she breaks down crying at her answering machine and Shinji talks himself out of going to help her.
Asuka during Arael when Shinji backs down from helping her in favour of obeying his father.
Rei when she wakes up after Armisael and doesn't act the way he expects.
Every single time he makes the decision to run away from those around him, his life gets worse and worse.
And Rebuild Shinji literally fuses Unit-01's core with Zeruel's (an idea that even someone who doesn't know anything would balk at) in order to save Rei, a woman who is already dead and the spitting image of his mother. He didn't know what he was doing, which prevents him from being just as bad as Gendo, but he still dooms the world for what he wants, which are the same things his father wants: to save a dead woman he loves.
And in Rebuild 3.0, when he does know what he's doing...He does the exact same thing. Even when everyone he knows is telling him to stop, he still goes ahead and tries to sacrifice everything for the sake of a dead girl.
And even then, he's perfectly willing to abandon her if she doesn't act the way he wants her to.