introverts and extroverts have been tested to accell in different areas.

Being an extrovert is not the answer to all your problems. While being an extrovert is great for you socially, there are side effects, just the same for an introvert.

Think of it like this. When you experience a different lifestyle, you learn to appreciate different things, thus having different interests/specialties/traits.

You don't have to be an introvert to be timid. Since I generally like all the FF characters, I can't say I have anything against the 'shy' types or whatever. I'm pretty indifferent to it all.