That you're using a traditional PC or laptop. Put it on an Ultrabook with a touch-screen or a convertible... and now you've got a whole new way of interfacing the Windows platform. It still works the old way... but it also works in a new way that can be more convenient in a lot of situations. Devices with crazy-long battery life, slim profiles, low weight, low noise and heat output, fast starttime, sleep time, wake time. You don't have to want or need those things, you can still use it the way you used to - but they're there now, for the people who do.