Can’t automatic updates be turned off?
See paragraph two...
Indeed they can, in XP. Go to Start, Settings, Control Panel, Security Center and you'll find the controls to shut off automatic updates.
This follows the general rule of "if it ain't broke, don't fix it."
Most of the "updates" are to patch security holes, but if your antivirus software is worth a damn, and you don't click on stupid stuff, you don't need them.
Some are actually counterproductive. MS released an "update" to Office 2003 that made it so it would no longer read Office 97 files. And their release notes said nothing about that great improvement.
"If it ain't broke, don't fix it."
Yes.