Or at least, it would be, without limiting it to 79 characters.
My current reason is, if I ever do work on joint projects, or anyone wants to read my code, it's rude to make them scroll sideways. Sideways scrolling is the work of the devil.
EDIT: Haha, I also now realise the irony that someone will need to scroll sideways to see the entire line. Oh well, the presence of a horizontal scrollybar at the bottom of the screen is proof enough, of my point.
For some weird reason, or maybe I am Obsessive Compulsive, I "try" to limit, when I
can, to 80 characters, because that's the width that CRTs used to be when I started
doing this.... And for printability reasons, which I rarely even do anymore.