Like the average driver (American or otherwise) handles themselves behind the wheel well enough or tackles the kinds of terrain for it to make a difference.
The differences some of you are raising is tantamount to the shit that would matter to professional test drivers.
Anything any manufacturer makes nowadays will handle, accelerate and brake more than enough to carry some of you to the mall or Krogers. You're not out tackling Watkins Glen or some Euro countryside.
For the Americans it matters to practically...they're measuring performance in a quarter mile of straight, flat pavement.
If I'm going to buy an expensive near top of the line sporty car that stuff would matter to me just out of principle. By your reasoning I could say there is no reason to by a car like that at all considering an 800hp Mustang has no practical purpose and definitely not one for just going to the grocery store and back. I could understand at least somewhat the thinking behind people buying it just because it's cool, but in that case it might as well be made as well as possible and perform as well as possible considering all factors.