You also can't convince nerds that excessive degrees of freedom are a serious usability problem.<p>After all, doing six things at once while remembering the state of a bunch of invisible stateful objects -- tabs, background apps, file hierarchies -- is the nerd core skill.<p>Meanwhile, I would note that Apple has apparently sold about 35 million iPod Touches:<p><a href="http://theappleblog.com/2010/01/28/ipod-touch-now-outselling-iphone/" rel="nofollow">http://theappleblog.com/2010/01/28/ipod-touch-now-outselling...</a><p>... which exhibit the exact same set of "missing features" as the iPad.