I am good with computers so I know these ways. I understand the conventions of computing. I understand them because that’s what I’m interested in and where I’ve spent my time. I enjoy computers and what I can do with them.

But not everybody does.

In fact, I’d wager most people don’t enjoy their interactions with computers. They’re confusing. Why? Because they’re unpredictable. Doing the same thing over and over doesn’t always produce the same result.

— Computers are not predictable | Tech in the Trenches

One of the reasons why tablets and smartphones are becoming popular ways to use technology is that they’re far more predictable. Less cognitive overhead, and consistent user experience make these device much easier for ordinary people to grasp.