Agreed. Of course thinness matters to some extent— I wouldn’t want to cram a three-inch-thick laptop into my bag. But—even ignoring ultrabooks— any, say, Mac

Agreed. Of course thinness matters to some extent— I wouldn’t want to cram a three-inch-thick laptop into my bag. But—even ignoring ultrabooks— any, say, MacBook Pro or Dell Latitude from the past decade (or two!) is thin enough to not give a second thought. I’m all for maximizing portability, but it’s not worth sacrificing durability and utility. That’s what tablets are for.