Introversion and extraversion are preferences, not skills. People who are introverted can do all the things that an extravert can, they just don't want to. It

Introversion and extraversion are preferences, not skills. People who are introverted can do all the things that an extravert can, they just don't want to. It's also possible to develop one even though your preference is for another. You may just be a well-rounded person in terms of social skills. To make a long story short, phrasing things in terms of a strict dichotomy is an oversimplification, but I think it's one that makes this author's point clearer. It's difficult to discuss all of the ins and outs without making a piece like this overly complex.