I am very similar to the "loyal reader" from the article. However, I've noticed tangible changes in my personality the more I face uncomfortable situations. I am starting to enjoy the rush I get after doing a presentation, and I don't worry about the speech for weeks before like I used to. I actually thought I would never get better at handling social/presentation situations.

A personal enlightenment I had is that there is no magic combination of personality traits that makes you successful in business. The more business people you meet, the more you realize that everyone has ways about them that might be seen as detrimental to their success, but haven't been.