This is what I like: we have someone with an actual Ph.D. doing real personality research, research that even involves the brain! Most of the 'real' research on personality usually just involves the Big Five, and that touches on what I was saying
here. I.e., the usual approach to academic personality typing is just "shut up and calculate" without any understanding of the psychological mechanisms behind the behaviour. That is why it was comparable to quantum mechanics to me... It also touches on
here in that his results show that the traits are simply correlated, and therefore not like the hard sciences. Anyway, I suspect the research is not perfect, but it is a big step forward over the Big Five approach or something which is simply subjective, with no scientific basis at all. If I remember correctly, he won an award for his research and he was teacher of the year at UCLA... That's far better than someone guding the research subjectively with no qualifications! (Which is unfortunately the case for almost all Jungian personality typing and the Enneagram - and including myself!...)