Summary: Simplicity depends on the capacity of the information channel and what's simple for one device, can be primitive or intricate for another, since screens are information channels with a limited capacity. When you're designing for multiple devices, don't go by common cliches like "simple is good."
Raluca Budiu is Director of Research at Nielsen Norman Group, where she consults for clients from a variety of industries and presents tutorials on mobile usability, designing interfaces for multiple devices, quantitative usability methods, cognitive psychology for designers, and principles of human-computer interaction. She also serves as editor for the articles published on NNgroup.com. Raluca coauthored the NN/g reports on tablet usability, mobile usability, iPad usability, and the usability of children's websites, as well as the book Mobile Usability. She holds a Ph.D. from Carnegie Mellon University.