Sorry but (after spending some time in this thread) I fail to see the point of bringing up extremes... I'm merely arguing for a couple of smaller smartphones on the market. Not because I have small hands, just because I don't really care for a huge screen. With the wide variety of mobile phones (in all sizes between 5-6") on the market they could squeeze in a sub-5 incher somewhere. Especially since just a couple of years ago this was considered huge. Hand size hasn't changed over the years.
It would definitely not make any sense to create a car with a seat where most people wouldn't reach the pedals or be able to look out the window. What you're looking for is customization. And yes, I think that car manufacturers should offer custom versions of their models tailored to people smaller or larger than average, I think that would be cool.
Every ergonomic setting on my car is at the extreme and it's still not right. I need the ceiling to be taller and the windshield to be taller and the steering column to be further from the floor.
The best car I ever drove was the silly VW New Beetle