> With mobile UI, that's kinda necessary. You don't have a whole lot of space to work with there. It's either really tightly packed touchscreen interfaces, or its horribly overloaded buttons ("when you're in the email app, press the Hang Up button to delete a message").

Or using a PDA-like UI with miniaturized desktop UI elements, but that style requires a stylus to use which is why the simpler, chunkier smartphone touch UIs became popular in the first place.