This is the key paragraph:
But those editing decisions are made by the movie studios, if not by the directors themselves. Not by a handful of people in Utah..
The copyright holder want to retain control of the material. This is the most basic aspect of business sense. If you own something, you don't let control of it slip away.
Then they should not allow sales of their DVDs and only rent them like Xerox used to do with their copiers. No sales allowed.