>I'm appalled why so many tablet vendors don't ship with a digitizer built-in. Strip that useless rear-facing camera and put a digitizer in there! You could go as far as selling without the pen by default, as long as there's an option to buy one!
Supposedly implementing N-Trig over Wacom allows the device to be thinner. This explains why Microsoft was willing to make the tradeoff. It also explains why most vendors don't use digitizers. I wish they did, but everyone is obsessed with making the thinnest device possible, even at the expense of functionality.