[citation][nom]killerclick[/nom]AIOs are for fashion victims. Low powered components (3770T and 7850M), you can't replace the screen, CPU, MB, graphics (right?), yet it isn't really portable. It's a desktop with all the disadvantages of a laptop - why not instead get a laptop and an external display?[/citation]
Because you can't attach those to a wall and have a complete package in one place that allows multi touch with no mouse to deal with and a keyboard tucked away unless you need it.
Touch AIO's are designed as appliances, not meant as a primary machine or necesarily as a device to do serious work, or play on for that matter. No upgrades would be needed it this case. Fashion doesn't enter into it, they serve a different purpose then our gaming rigs, and our work notebooks.