They asked a similar question about the calculator.
A math teacher once remarked to me, "Some of my students are incapable of telling whether an answer is reasonable or not. For instance, 2 divided by 5 equals 10, some of them say. Reasonably, if you divide a number by something bigger than itself, the answer will be less than one. But if the calculator says it's ten, it must be ten."
In other words they pressed the wrong button and multiplied but don't have any foundation for questioning the answer they get.
Of course if you put the camera on autofocus and the picture comes back out of focus, the result is more obvious.
One thing I notice is that automation will lull me into a false sense of security sometimes. Used to be, you focused on something and it stayed focused. Last night, a couple wanted me to take their picture. Fine, I pointed the camera at them, and I was all about framing it just so. When I took the picture, d'oh! They rearranged themselves ever so slightly while I did that...slightly enough that my AF point now landed on the sign 10 feet behind them (which came out sharp as a tack btw).
Nice!
As for the 5MT I think driving is boring enough...gimme something to do! My family said, "Driving in Dallas, you won't want to shift...." Uh, yeah, I still do. Manual focus is like a manual transmission, but I'm swimming upstream on that one for sure.
But when it comes to photos, beauty is in the eye of the beholder. When instamatics deliver a result other than we wanted or expected, it's natural (for some) to wonder why. More advanced cameras let you manipulate more. Some laugh at the cost and say, "The picture wasn't THAT important." So be it. For others, like many of us posting in here, it's worth the money and it's worth the time to understand the how and why.