I'm not so sure about optimal. Touch screen input devices always come with software that tries (and often fails, to humorous effect) to correct your typing beca

I'm not so sure about optimal. Touch screen input devices always come with software that tries (and often fails, to humorous effect) to correct your typing because typing on a slick surface with no tactile feedback, to coin a phrase, fucking blows. I think it's got more to do with negative perception. Keyboards found their way onto cheap (read: awful) Android phones and better (but app-less) Blackberry phones and the mindset carries the perception home. If Apple were to come out with a keyboard phone, the rest of the industry would be doing it overnight before the sales numbers were in.