And maybe it's because it's not just time that matters but the experience. If I'm sitting on the couch or lying in bed, it's a hell of a lot easier and more pleasant to just grab a tablet. Much of it is the form factor. Propping a laptop up on my lap in bed or on a couch is unwieldy and awkward. Holding a tablet is like holding a book. Better experience.
Agreed. Also, MBA has a lid that has to be lifted open. I find I need two hands to do this, one to push the lid up and one to hold the body down. It's not *that* much of a bother, maybe, but it's still not as hassle-free as just picking up a tablet. Oh, and don't tell me you keep the MBA on your desk with the lid open all the time. If you do, you are just using it as a desktop, and that's a completely different use case from portability devices.