So I've been thinking a lot about important traits of startup founders. I keep coming back to the notion that the single, most indispensable trait of a startup founder is the ability to pick up the phone and make a cold call to a potential client about a product that is far from perfect. I can't think of any skill that is more important than this one (and all of its variations...arguably the elevator pitch is a good realization of this ability). In my opinion, all of the technical and business know-how won't mean diddly if the founder(s) don't have this skill.
I'm interested in what others think about this assertion.