Exactly.
Also, do you ride much after dark? Even with a good light there's times you're not sure exactly of the surface you are riding, at least I ain't.
'Nother thing... there's times when I for one prefer to bail entirely off of the asphalt to allow a truck or some such to pass on a narrow road. Amazing how much better control one has when bailing onto the unpaved road margins when equipped with a good set of fat tires and a sprung fork.
Mike