It's a callback to Tony Stark building his first suit in 2008's "Iron Man," which kicked off the entire MCU. One of the main plot points of "Endgame ... the effects of the snap and bring everybody ...

Downey made the same point, that bringing back Iron Man might ruin Endgame. “If I pick the jersey up and put it on again, wouldn’t you feel a little bit like ‘Oh, crap!’?” Rogan replied ...

While Endgame’s post-Snap imagery creates powerful moments that underline the nefarious effects of Thano’s actions, they also sacrifice what could have been a much more compelling ethical debate.