When the Slashdot crowd can't make the distinction, what chance does Joe Consumer?
The difference between a touchscreen and multitouch screen is what make the iPhone's (once-)unique method of implementing its OS features possible.
You may think that "touch is touch is touch, it's all the same" (Not YOU in particular, as I don't know you or what you think, but you the straw-man I'm railing against), but a swipe gesture with a finger is not the same as a swipe gesture with a stylus, no matter what your Slashdot reading self may think.
Because of the iPhone, the method of interacting with the feature-set of one's smartphone has changed on all phones.
Apple's total method has defined the rules of multi-touch Phone UI, and Apple defined having a multi-touch capable screen as what it is to BE a "touch screen phone".
If Joe Consumer hears "touch-screen", it better do what the iPhone's screen does.