We spend more time watching Thanos explain his trauma on his homeworld than we do watching some of the Avengers talk to each other. That is insane. And yet, it works. When he sacrifices Gamora on Vormir, the movie forces you to feel a flicker of tragedy for a genocidal maniac. That uncomfortable knot in your stomach? That’s good writing. Marvel had a huge structural problem: How do you put Doctor Strange, Spider-Man, the Guardians of the Galaxy, and Thor in the same room without the runtime hitting five hours?
Fans screamed. Logic brains broke. "Just wait five seconds and take the glove!"
That scene rewrites Tony’s entire arc. It stops being about his ego. It becomes about PTSD and failure. That is why Endgame works—because Infinity War had the guts to break Tony completely first. Let’s address the elephant in the room. Star-Lord punching Thanos while Mantis has him subdued. "WHY WOULD HE DO THAT?!"