Hmmm, I know it's been discussed before, and I agree there's little point. On the other hand how many hatchbacks do you know that have a hatch popper that would allow the hatch to open fully "automaticaly". Martin L has I think hit the proverbial nail. Not only a safety issue, but you wouldn't want to be parked close in front of another car or even a wall and hit the button without thinking..... OUCH !!!.
A "boot" on the other hand is an entirely different matter as it opens within the length of the car.
(PS. I majored on the "Bleeding obvious"
)