Users tell us that they want more from their apps — one or two features doesn’t satisfy their needs. They also tell us that they want “simple” apps. Keep in mind that “simple” should not be confused with “simplistic.” Simplicity should not be accomplished by sacrificing power. Simplicity is the user experience. With a clutter of apps on their device that just do one or two things, users constantly switch between them — which is counter-productive. In fact, users tell us that they can’t even remember what information is in which app. The users are demanding more simplicity and completeness in their apps, and these two concepts should not negate one another. In addition, due to the nature of simplistic apps, they don’t have stickiness with users and are constantly replaced.
(via Why Most To-do List Apps Are Doomed to Fail | LightArrow Inc)