Sigh... talk about missing the point. The danger with automatic updates isn't that the update itself will fail. In three years of using WordPress continually, I never had an update fail me.

No, the danger is that a perfectly successful update will break something in the website. A plugin. A theme. Some other customization. And you won't know until the next morning... or until Monday morning... or until you return from vacation. And by that time you won't even be able to tell if it was the update that broke things or something else. You'll lose readers, and possibly buyers, you'll waste time and energy, and all because a dumb piece of software thought it knew better than a human being.

I'm one of those 25% who will never, ever enable auto-updates in any way, shape or form. Too bad you refuse to understand why.