The best technologies disappear into the environment to minimize distraction from the content or experience at hand. Yet we design for distraction, and we call it engagement. When you say "engagement," I now hear "theft of attention."
Designers often conflate device context with user context—or worse, with user intent. “This is mobile, so they’ll never want to do that.” ”This is mobile, so it’s aimed only at users on the go.” Friends, this is hooey.
If you want to take advantage of the new iPad’s gorgeous screen (and of course you do), every image you push down the wire is about to put on a ton of weight. That has implications in lots of places and for lots of people.
More and more, when we refer to mobile, what we really mean is “non-traditional computing devices and environments,” a stodgy mouthful that really boils down to not the desktop. We need a new term for our sprawling landscape of devices.