I thought it was documented that a British editor did the first rough cut?
In any case, the Oscars Marcia Lucas, Richard Chew, and Paul Hirsch received for editing Star Wars speaks for itself.
This.
All I have to do is watch the prequels to see what a GL film looks like when he has no one around to reign him in or say “no” when needed.
Read the posts above you.
Also there a lot of good editing moments in the PT.
For example, the 123 editing of-
“Who could have done this” -cut to- Anakin slaughtering the separatists -cut to- Palpatine monologuing about the first Galactic Empire.