It&#x27;s neither handheld or desktop, it&#x27;s the pace of advancement.<p>In 2005, it was a frustrating and nearly impossible task to use software made for Windows 95. In 2016, it&#x27;s much easier to emulate a 2005 environment.<p>Same for mobiles. As the relative gains from each generation to the next taper off, there will be less to radically change from the ground up.