There a trade off built into nearly every tech product by default — one that shapes opinions of the product and either pumps or prohibits its market share: functionality vs. user friendliness. There were, for instance, many digital music players prior to the iPod, but only Apple device managed to simplify the experience into a single control wheel. Combined with iTunes, which allowed users to simply plug in and sync rather than messing with folder hierarchies. The iPod was destined to be a...