Originally Posted by Andrew H.
Exactly right. A semi-truck can do a lot more than a sedan, or even a pickup truck. But most people don't need a semi.
And more to the point, a portable device means that you can do your less-powerful chores (almost) anyplace you happen to be. This is a huge improvement in utility.
There is also the fact that portable devices are getting more powerful. Even if today's devices aren't powerful enough for your needs, in a couple of years...