“oh mi god, Spider-Man Homecoming is just Iron Man 4, I’m so-“
Shut up. Tony Stark is the one character who actually fits as a supporting character for a Spider-Man movie. And not because the other big Avenger is now a fugitive. Peter’s motivations have always been about guilt. And no other character in the MCU gets that more than Tony Stark. Peter and Tony work as a great teacher/student and father/son dynamic. It’s been set up in Civil War that Tony cares about Peter and he wants to help Peter in his life of crime fighting. And Peter clearly looks up to Tony and wants to impress him however he can. Tony is literally the only character in the MCU that would work as a supporting character for a Spider-Man movie at this point. It also has the added bonus of emphasizing Peter as a small guy in a big world that he isn’t quite ready for.