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I referenced to the topic of Extraversion/Introversion in another thread recently. It becomes more convaluted because it's easy to go to one extreme or the other. Jung stated that no one has a pure attitude preference. Instead the majority fall in the middle, as with the functions.

I agree with the author that:

The stereotyping comes when we imagine that the two functions are opposing extremes, whereas reality is that everybody needs some time by themselves, particularly if they are in a busy job with lots of social contact, and everybody needs some time with other people. There are also those who for various reasons find it hard to deal with change, and noise, and bright lights, and who may need time in a peaceful, darkened room to recharge, making them seem more introverted than they necessarily are. And there are those who seem well-balanced, able to socialise and also to enjoy their own company.

Even the ESTP says that:

I don’t have a whole lot of really deep friendships, but yet I like to think people would describe me as dedicated, determined, and loyal. I sometimes have difficulty concealing what I am thinking or feeling. I don’t like the pressure of having to say no. I can be somewhat cool but a genuine friend as a personal relationship evolves.

Other statements from that description can be deemed introverted qualities like

The most important thing in relationships is absolute autonomy and independence. I admit I like to be in control and yet I’m kind of easygoing in that I just want freedom. Freedom to me is leave me alone, let me do it. Anything that constrains me around that I don’t like and kind of rebel against. I don’t like to be told what to do or what to think.

and;

Sometimes I have to tone it down a little bit—people may read me the wrong way. I’m very comfortable working either together as a team or individually.

I think we all agree that introverted types that have a good use of Fe can appear extraverted and extraverted thinking types that have the “In Charge” interaction style can have introverted tendencies. Contrast the ESTP with even the ISTP, and you find that there can be confusion along the E/I dichotomy. ISTPs say:

I have only a few close friends that I really see a lot. Yet people have seen me as someone very lively and talkative. That’s the part of me that likes life to be an adventure.

as well as;

In my work, I don’t want to be just doing stuff for the sake of doing stuff. I like to accomplish things—make a contribution. That’s real important. I take a “do it” type of approach. It’s very practical. It’s very here and now. That does not mean I don’t take into consideration the big picture and what’s down the road and what’s best for the organization, but at the same time my big focus is “let’s get this show on the road and let’s do it.” I do it as well as I can. Then I think very well on my feet. I can be quick with the verbal comeback—I like the impact. I just get in there and do it, and whatever job I go into, I hit the ground running. And I’m very competitive, often with myself. I tie one hand behind my back and see if I can still do it.

These remarks could easily apply to the average extraverted type in addition to;

I rarely work on one thing at a time. I get an idea and chase it down. I’m always studying—not just books but looking at what interests me. I customize everything I touch; people tell me I can’t do something, and I say sure I can. And I like time to just sit down and enjoy. But when I have too much time I tend to just pick away at things.