[drblast]

I have an oven that's about four feet wide that I hardly ever use for anything larger than a 12 inch cake.

And I have more than one bathroom even though it's really rare that more than one person has to use the bathroom at the same time.

I have a mountain bike that I only occasionally take up a mountain.

My car can brake in a ridiculously short distance, even though I've only used that feature to save my life once.

I wear a seatbelt all the time, even though I've never been in an accident where it would have made a difference.

Edge cases matter. A lot. The Smart car covers the "every possible travel condition that a college student can think of" case very well, but it's not versatile enough for most people.

[DanielStraight]

Edge cases can also be served by rentals though. If you could rent an oven or a bathroom as easily as you could rent a car, your home may be designed differently.