Spider-Man: Far From Home was a movie that exceeded our expectations, acting as an epilogue to Avengers: Endgame while also planting the seeds for Spider-Man's future role in the MCU. The movie managed to be a standalone Spider-Man film that also dealt with the legacy of Tony Stark and all the good and bad things Peter has to inherit from his mentor, like bitter former workers who don't mind killing children.
Many expected a bigger role from Robert Downey Jr's Iron Man since he did play a part in the previous film Spider-Man: Homecoming. Plus, fans just wanted to see Robert Downey's Iron Man one more time but it looks like that was never in the cards, at least according to Far From Home writers Chris McKenna and Erik Sommers.
During an interview with The Hollywood Reporter, both writers stated that there were never any concrete plans to have a new Robert Downey Jr. cameo. The most they did was with images in the film's beginning and a brief clip from Captain America: Civil War. Apparently, this was all they needed since this is what was best for the story.
"I think if anything, it was always going to be re-used footage. We had talked about possibly hearing Tony's voice through EDITH at one point, but I think a little goes a long way and we didn't want to lean too hard."
"Doing the flashback like we did with Civil War is probably the most you'd want to see and hear Tony in this movie. Like Erik says, if you are doing a movie about loss, you don't want to keep going to the well. 'He's still alive and now he's a hologram, showing you around Avengers compound.'"
Spider-Man: Far From Home is now showing in theaters.