Progressive disclosure defers advanced or rarely used features to a secondary screen, making applications easier to learn and less error-prone.

On the Web, all advantages are temporary, and you must keep innovating to stay ahead

Developing fewer features allows you to conserve development resources and spend more time refining those features that users really need. Fewer features mean fewer things to confuse users, less risk of user errors, less description and documentation, and therefore simpler Help content. Removing any one feature automatically increases the usability of the remaining ones.

Even the best designers produce successful products only if their designs solve the right problems. A wonderful interface to the wrong features will fail.

What we learned is money doesn't grow on trees.

To design an easy-to-use interface, pay attention to what users do, not what they say. Self-reported claims are unreliable, as are user speculations about future behavior.

Popularity is the product of two factors: (a) how compelling material you offer, and (b) how easy it is to access it. Host free pirated movies and users will flock to the site, even if it's difficult to use.