The biggest mistake here is treating Mjolnir’s worthiness like a reward for doing enough good deeds. Tony absolutely became selfless. He sacrificed himself in Endgame, repeatedly put his life on the line, and eventually chose the universe over the life he had built with his family. But Tony’s biggest flaw was never cowardice. It was control. He constantly believed that if he could just build the right armor, make the right plan, or control the right variables, he could prevent everyone from getting hurt. That’s very different from Steve. Steve’s entire character is built around doing what he believes is right even when he has no control over the outcome. He doesn't need to be the smartest person in the room or have a plan that guarantees victory. He'll stand there and take the hit anyway. And Tony eventually learned that lesson too. That’s what makes his ending so good. But I don’t think his sacrifice means he suddenly became the same kind of person as Steve. Tony became a better man without completely becoming Steve Rogers. So if Mjolnir judges the person rather than the sacrifice, I can understand why Tony never lifted it. The interesting part is that by Endgame, I honestly think he was probably much closer to worthy than he ever was before.