Erm... the preferred configuration is unprompted and unattended installation of Windows updates, you only "notice" them in the sense that you see a Windows Update icon appearing and disappearing in the notification bar if you're there at your set update times.
I absolutely hate the auto-update feature of chrome.
As for the not maintained applications, I think users should stop using them (and upgrading to a maintained alternative). Old applications should not be the reason for not upgrading the platform under which the app runs.
You can't turn off automatic updates in Chrome.
"It just creates thousands of configurations for a web developer to worry about."
Absolutely the opposite. I don't know why this is so hard to see. When users aren't given the option to update, they all end up with the same version. So there is literally only one configuration to worry about.
1. http://google-chrome-browser.com/how-google-speeds-chrome-re...