I just didn't want to imply that introverts can't do the job. I'm very introverted, and when called upon to network and maintain client relationships, I could do it just fine, but saw it as a burden rather than a pleasure. One advantage I guess I had was that I saw it as work, and prepared for with the same level of effort I would have for an important presentation. But I couldn't sustain that for very long without going crazy, so I'm glad we had people who liked doing it as much as I liked programming and design.