“A complex system that works is invariably found to have evolved from a simple system that worked. The inverse proposition also appears to be true: A complex system designed from scratch never works and cannot be made to work. You have to start over, beginning with a working simple system.”

- John Gall

John Gruber makes a good point that a feature that is needed is different from a feature that is nice to have

The iPhone exemplifies this strategy. There’s a long list of features many experts and pundits claimed the original 1.0 iPhone needed but lacked. Ends up it didn’t need any of them. Nice to have is not the same thing asnecessary. But things the iPhone did have, which other phones lacked, truly were necessary in terms of providing the sort of great leap forward in the overall experience that Apple was shooting for.