I reiterate: I am not arguing against Jungian psychology. I am arguing against the well-known MBTI instrument that is promoted, and sold by the Myers-Brigg Fou

I reiterate: I am not arguing against Jungian psychology. I am arguing against the well-known MBTI instrument that is promoted, and sold by the Myers-Brigg Foundation (http://www.myersbriggs.org/ http://www.myersbriggs.org/) as a tool to support therapists, employers, teachers, parents, and so on in their decision making. Yes, I'm bayonetting a strawman. But that's because the Myers-Brigg Foundation set this strawman on an altar and made themselves high-priests, and they promise miracles to those who pay the entrance fee. You're quite right that I know very little about Jungian psychology. That's why I focus on intro- / extraversion; because that's something I do know about and is well recognised in other schools of psychology. I also explained that the non-dichotomous nature of intro- / extraversion makes the MTBI I/E distinction almost useless. But you tell me that the other psychologists have got it wrong. That the I/E distinction really is dichotomous, like left- / right-handedness. In that case, the MTBI test is even more useless, because it can't reliably distinguish them!