I have been perusing some of the online descriptions of the NTPs recently, and I have noticed that the line between introversion and extraversion here is extremely blurred. For example, in almost every description I have read of the INTP, they are described as being mostly introverted but very extraverted when given an opportunity to speak about a topic that they are interested in. Similarly, ENTPs are described as primarily extraverted but with a sort of second inner identity which only they and their closest friends glimpse. Why is there so much ambiguity here?
I have a theory, but I am interested in any other possible explanations.