I highly recommend you watch the End of Evangelion and Rebuild movies if you get a chance. Ultimately, I think Eva is ambivalent about the value of saving the world, far and away from the ability to do so. By the end of 3.0+1.0, Shinji essentially HAS saved the world, except that that's not the important victory. In the end, Eva doesn't care about canonicity, and it barely cares about narrative. It's instead more interested in characters, and their relationships to each other and the world they inhabit. Everything else is malleable to produce interesting dynamics between each actor. It's fascinating in how experimental it is, and not just because it superficially upends assumptions about how stories should play out.
