So perhaps a better question might have been:
If a PT really were necessary to tell a complete Star Wars tale, what would have been the best tale to tell? What should have been left out?
There probably are already threads addressing this.
Anakin of course.
We should have seen Darth Vader in the PT and no Anakin but only mentions of a great Jedi knight called Anakin.
Obi-wan's story... Well did we really need to see him go in to battle with his friend on the volcano if it was already known it could just as well happened off screen. Imagine Obi-wan having to explain that the great Jedi knight was a traitor to a council and that he killed him. Would we even trust him on his word? We never saw what happened...
There was perhaps a big angle of story telling for the council perhaps being dubious about trusting Obi-wans word on the matter and would he in fact be the traitor raising suspicion amongst a back drop of Revenge killings from a man in a Black cloak with an iron lung systematically hunting down the Jedi.
That is surely better story telling?