No the problem with these stealth updates is that you don't know something is being changed. Your system starts to perform poorly or even applications start to crash and so on. Had you known what was updated and when, then rolling back is a breeze. But when you don't know... then how do you fix it?
Also if you as a user have expressly turned automatic updates off (which many corporations do for testing purposes) and the system STILL updates itself... then the question arises, what else is being changed without your knowledge or consent?
