With the delay between touch input and screen response slashed by orders of magnitude, a device that sports the sort of super-low-latency Dietz envisions has the potential to feel far more (for lack of a better term) natural than its brethren.
After navigating through four submenus, you arrive at a screen where you're faced with configuration options: delay time, pen width, pen color, screen transparency.
Beyond the expense associated with adding a touch screen, and beyond the corporate decision to delay their inclusion, there are a number of reasons why the touch transition is years away from completion.