Avengers: Endgame co-screenwriter Stephen McFeely reveals the movie nearly revisited another Marvel Cinematic Universe movie. Ultimately, the decision was changed to go back in time to the first Avengers movie, which is probably for the best. MCU fans were excited to see Tony Stark, Bruce Banner, and Steve Rogers revisit the Battle of New York, even though Smart Hulk wasn't too happy to see his past-self destroying things in an aggressive and rather brainless manner. The original idea was to bring Iron Man into Thor's world.
Stephen McFeely admits that the original plan for Avengers: Endgame was to take Iron Man and have him go back to Thor: The Dark World to secure the Tesseract. Even Chris Hemsworth admits the Thor sequel isn't the best movie, and many MCU fans would place it at the bottom of their lists. But, there was a logistical reason to bring Tony Stark to Asgard, as McFeely reveals. He had this to say.
"Technically in Thor: The Dark World, the Tesseract is in the vault as the Aether is also there. So that sent Tony to Asgard, and he had an invisible stealth suit, and he fought Heimdall, who could of course see him. I think (co-director Joe Russo) went in and said, 'Why don't we go in to Avengers? It's the biggest movie, it's the most fun, let's go.'"
In the end, the creative team probably made the best decision for Avengers: Endgame and where they obtained the Tesseract. With that being said, it would have been great to see Idris Elba make an MCU return after his Heimdall character was killed by Thanos at the beginning of Infinity War. There were more than enough stars in Endgame, so he wasn't technically needed to push the story forward, no matter how much fans would have liked it.
Heading back to the Battle of New York allowed Tom Hiddleston's Loki a chance to come back. Fans were excited to see the God of Mischief return and it gave us confirmation that the character still exists in an alternate reality after he was able to escape. Loki was also killed by Thanos at the beginning of Infinity War as his brother Thor watched helplessly. Loki tried his best to take out Thanos, but it was Heimdall who was able to send Hulk back to Earth to warn everybody about the Mad Titan.
Avengers: Endgame packs a lot into its three-hour runtime, but it still left fans wanting more. Christopher Markus and Stephen McFeely were able to string things together in a pretty satisfying manner. When it came time to make the decision on whether or not to kill off Tony Stark, McFeely reveals that the studio left it up to them to decide. So, after a five-year time jump, the screenwriters and the Russo Brothers decided that his story had been told, which is another reason why it was wise to return to the first Avengers movie. You can check out the rest of the interview with McFeely and the rest of the crew over at Empire.