Re: Or...
"Fairly simple for most people I would have thought."
You have to teach users that the button has to be pressed momentarily - and then wait. It is a Goldilocks push - not too fast and not too slow.
When it doesn't appear to do anything immediately they will try again. Eventually they hold it in until the PC switches off - producing a "4 second" crash power-off which can corrupt disks or mess up applications saving data.