I’ve been using laptops for decades. The first one I ever owned was a PowerBook 3400c, and I’ve never not owned one since then. But now, in contrast to my iPad, my laptop seems altogether much more cumbersome than I prefer to deal with. It’s much, much heavier and bulkier than my iPad, especially when you factor in its power supply and a carrying case.
It’s much more fragile, too—I regularly toss my iPad around in ways that I would never do with my MacBook—and as a result, it’s much less versatile, at least for me. This is partly because the MacBook also restricts my movement; I have to be sitting or standing in a way that accommodates typing, whereas I have so much flexibility with my tablet that I’ve become accustomed to using it while positioned in just about any variant of laying down, sitting, standing or even walking.
He's not done with OS X – an important distinction.