Now, I'm smart enough to not press the shutter when the subject is not smiling, when a smile is required, but I'm not always quick enough to avoid pressing the shutter when the subject is blinking.
Then you have the wrong blinking subject! Sorry, just couldnīt resist that cheapo one.
I would hate to have a camera decide when it releases itself - how bloody arrogant of the makers and how limiting for the photographer. I think that some a/f systems wonīt allow release of shutter until max. focus has been attained, another instance when machine controls the human. It seems to me you are far better getting a slightly unsharp image of something that might be of great consequence than nothing at all because some arbitary notion of sharpness and its importance has ben decided in another brain than the camera operatorīs. I suppose that these systems have a switch-off function so that you can override them, but I feel that that kind of "function" is basically worthless and nothing more than another sales gimmick: a feature nobody really needs but adds to the list of other useless so-called advantages which can be factored in to raise the apparent market value and price, yes, mostly price.