I see your points and can agree with most of them-- but we're talking about making a Complete Saga (I think). This way, there is no "OT" and "PT" -- just the Saga.
ANH is definitely a complete story about Luke learning the force. It doesn't need the next two movies to be a story -- so the "OT" is really two stories.
ESB and ROTJ combine to make the second story -- but it is a bumpy ride with a lot of structural flaws (charming and otherwise).
Put in the other three films and you have a lot of ways to see it-- it's a bunch of individually flawed movies, three or maybe four individual stories strung together, or two "big" stories, or ONE GIANT story -- this project is about the Giant Story (again, "I think").