The whole point is the OT would be so different if Lucas were writing it 1-6 now, and I believe the PT would have been different too as we all alluded to many things that would not be in the PT to preserve the suspense of the OT. It just isn't about 'I am your father' cause this isn't a movie like The Sixth Sense, it is truly about a narrative that keeps its suspense and drama throughout and shouldn't have the viewer one step ahead of the characters, cause what is the reason to watch it then?
Now movies like Titanic and Apollo 13 are examples of movies that we all know the ending, but they are historical movies that are true in the sense of the story they are telling, so it is almost like a documentary, the devil is in the details, not in the suspense. But the great thing about both of those movies I named is there is still an aura of suspense and tension, especially at the end of Apollo 13 that makes the movie that much better, and that is a credit to its directors.
Nobody can honestly look at the 6 movies and say they flow well either way, they don't look the same, they don't feel the same, and they are written trying to tell one characters arcs story, yet the context of that character is totally different in each trilogy. I think the SW saga is the ultimate irony, cause sometimes less is more of everything in the movies: The characters, the backstory, and the use of CG, and what has happened is we all fell in love with the greatest trilogy of all-time, yet we are prisoner to the PT movies now as the EVERY boxset in the future will always contain the SE & PT, and the versions that made SW what it is, we'll wait and see everytime now.