Could it be that priests "disobey" or take liberties in certain areas because the particular rule or discipline is not explained, or there are no reasons given for it? Adults not in the military don't take well to "do this because I said so." And much of what has come out of Rome has been decreed on the basis of authority, which is the worst possible justification behind anything.
That's why I'm glad to see this draft leaked. There will now be world-wide input on something that was obviously intended to be clandestine.
Vatican bureaucrats feel that they would somehow be diminished by getting feedback from bishops in what is essentially a revision to discipline.
That's possible. Our priest seemed genuinely surprised when I told him that leavened bread was ilicit. Regardless, priests are supposed to obey their superiors, aren't they? (Unless commanded to do something intrinsically immoral). On the other hand, he likes to push the envelope, such as offering general absolution and having dancing girls during the Stations of the Cross. He knows general absolution is supposed to be reserved for grave circumstances, but he has told me that he considers the lack of participation in the sacrament of Penance to be an "emergency."
Or could it be that priests have no need to research on their own the genesis of liturgical practice?
Many of them have the time--you see them sitting on their butts during Communion while a fleet of EEM's does their job.