I had auto updates disabled on a windows system. One day Microsoft decided that i really needed an update and changed it. After a month of various problems the machine died. It would not even boot in safe mode. It took me a week to reinstall everything and get back to where I was.
An Microsoft auto update also messed my daughters PC up.
I have another PC where MS update is taking about 30% of the CPU. I have found that autoupdate is running but apparently failed a couple of years ago and has not worked since but autoupdate tries to run all the time. I have to manually stop the process every time I need to do anything. I know how to fix it, possibly, but have not so far found the time or the original license number.
I am about to give up on Firefox due to the sheer number of updates, have not updated to the latest yet despite the continual prompts.
The problem for an IT manager is that if you have a stable tested system running you do not want autoupdates applied as they stand a high risk of causing problems with your various applications. You need to test every update very thoroughly with all your applications before applying it to all your PCs.