Truth of the matter I don't care who gives the explanation as long as it makes sense.. if the Directors didn't gave a good explanation I would have challenged it and so would others .. but I do agree with you, Directors have final say - they control Acting, shooting, pacing, story, dialogue, etc, and if they don't like anything they can change it .. plus if a movie succeed or fail, they bear the most responsibility in the eyes of the studio, fans , ect.. On why some people accept Cap America and Peggy living in the main time line even though it will make no sense , is really simple , they just REALLY want it to be true ..