Yes, I can see what you are saying, but I think your understanding misses some key elements of the situation. Consider this. He does have authority (because that is our tradition) but not to change words in the Mass (which isn’t our tradition). And, what accountability does he have in this? If we changed the words of the Mass, which we don’t have the authority to do, we would be held accountable. No doubt. But, when he does that, which he has no more authority to do than I do, what happens. Nothing. Nothing at all. No accountability whatsoever. And, that is why it is a good example of the elitism inherent in non-traditional approaches to liturgy.
Okay, I think I see your point.