> The skills of a con artist are not related to the ability to build good systems.

lol.

Communication is about moving information through someone's senses and into a model constructed in their head. If you can't effectively communicate about yourself, the interviewer is going to make more inferences about you and may focus on areas that aren't your strengths while not even knowing to ask about strengths you think are very relevant.

It would be great if they could just sense your innate value through your aura, but it's not going to work. Being able to talk about yourself may feel uncomfortable or like self-aggrandizement, but that's actually a great reason to practice it. The interviewer wants to learn about you but also has a bunch of other explicit and implicit goals (get through the interview questions, to not be incredibly bored, etc), so there's no reason not to do a good job at honestly telling them about yourself.