Earlier quoted context omitted.
Not sure about that, at least in my workplace some of the people considered the smartest and best engineers are very quite, almost shy.
I have the opposite experience. I work in higher education, at an institution full of very smart, very talented people. There's a mix of both extroverted and introverted. The extroverts are all moving up the chain, while the (generally more talented) introverts stagnate earlier in their careers. I'm sure there's something there to study, but I'm also sure I don't know what it is.
My fiancee is a social ace. She knows how to make everyone feel good and always has a big smile. She connects deeply with people.
But when she's done she has to spent the next three days binge watching The Wire to recover.
A lot of introverts are very socially skilled, they just require time to get their energy back.