I'm interested
Ok. (Banana Mango is referring to my comment without explanation that Jungians usually argue that extroverts have weaker egos than introverts.)
I will say as a disclaimer than I'm not sure how much I'd buy into this idea, but...
... the psychobabble argument was that extroverts are hypersensitive to the fact that the world does NOT revolve around them, and so deep down they feel like to be "worth" anything they must be actively participating in the world. And while introverts too realize that everything doesn't revolve around them, either, they do see their own selves as the focal point of their existence.
Hence, extroverts often unconsciously think that
what you do is what makes you matter as a human being. Introverts often unconsciously think that it's
who you are that makes you matter as a human being.
Note that these aren't philosophical beliefs, but are unconscious tendencies that are revealed through patterns of a person's choices and behavior. (Supposedly -- I'm skeptical of this stuff.)
(An interesting aside, I've always found this philosophical question interesting: who is the better person, the evil man who does good in the world and doesn't show his evil in any detectable way, or the good man that tries hard and fails and accidentally causes great harm?)
It's more nuanced than that, but that's really the gist.
Also, as del mentioned, I tend to be action oriented. I may be thinking to myself all the while, but I like to be actively doing something (gardening, walking the dogs, working with my hands, working in the darkroom, framing, decorating, building things). I don't really understand how being action oriented would affect whether you're I or E. Some of my most introspective moments occur when I'm actively working on something in the world. Maybe I'm missing something?
There are two facets to this.
One is that, In the first place, for extroverts the entire point of action is more likely to be just about the action in and of itself rather than introspecting. Purposely using action as a vehicle to inspire introspection is more likely to be an introvert thing. Extroverts are less likely to think about themselves as the center of the action.
The second part will sort of contradict the first, but if extroverts WANT to introspect, they often can't do it without external verification. And by that I mean like... for example, an extrovert might purposely throw him or herself into an awkward situation just to see how they react. They can't predict beforehand. It's like their inner self is detached and to get a sense of it they have to do science experiments on it. Introverts don't need to do this often since they have such a strong sense of self and have access to their "inner self" so easily.
So yeah, it's way more complicated than the "likes to party" vs "likes to stay at home and read" stereotypes.