To me, Stark revealing he was Iron Man was a total mic drop moment. That film would have been received VERY differently if the movie made Tony keep his secret identity. In fact, that was one of the things that makes me love that movie. As has been stated elsewhere: "Using secret identities wouldn’t have worked if the heroes were unknown to each other or to the larger world. The masks had to come off early and often if only to establish complete trust between the heroes." I personally think it was a great creative decision by Feige.