For many years, even as users became more sophisticated, personal computers took too much effort to use without problem-solving, keeping alive the yearning for greater simplicity. Microsoft's dominant Windows platform, in particular, was a home for all manner of bugs and problems that required IT people to straighten out.

By the 2010s, almost everybody in the developed world, it seemed, had a powerful digital device that took little or no special skills or training to use.

In 2007, everything changed with the iPhone. As crippled as that first model now seems, with its lack of apps and glacial cellular connectivity, the iPhone was a practical, useful, self-contained computer a child could understand. It was an information appliance.

Walt Mossberg Quotes