Ben Bajarin:

Microsoft needs developers to be writing touch based applications but my concern with the touch based hardware fragmentation is that it will may cause them to target only specific screen sizes and not others. This would mean that the touch based software experience will be better on some Windows 8 hardware but not others. I can tell you right now that an application that is built for 10” Windows 8 hardware is not going to be a pleasant experience on a 27” all-in-one running Windows 8 with a touch screen.