It is one of my favorite stimuli in psychometrics and the philosophy of science. I already sent it to quite a few people, as a long-read remark on the applicability of models.
Of course, as long as you read it at the meta-level, comparing with other tools (scientific, pseudo-scientific), for example: Four Temperaments, MBTI, Big Five, Western Zodiac, Chinese Zodiac, etc.
While many predictions are bogus (e.g. month of birth and relationship comparability, vide https://www.gwern.net/docs/psychology/okcupid/howyourraceaff...) they capture various traits of character people consider important.
The difference between science and pseudo-science is much more smooth than most scientists would like to admit. While MBTI is not up to academics standards, it is highly correlated with Big Five, trait by trait (still, AFAIR there is reason to use it in the place of Big Five). Plus, there is too much Jungian interpretation for MBTI, which is not up to current scientific standards. Still, I defended MBTI (in a dating context, e.g. as a self-identification) more times than I care to admit (for some insights, this https://www.16personalities.com/ is decent).
There is also a corollary that psychology is still in its infancy, much like biology before the discovery of bacteria, viri, or DNA.
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In mathematics, there is a concept of a basis - more or less, directions, or orientation. We can express the same thing is a few different ways. Some bases are better (unit length, dimensions are orthogonal (uncorrelated)), but otherwise there is a lot of room here.
In this case, Colors of Mana are one basis. Just because it is an impromptu psychological explanation, does not mean it does not work. Yet:
- Some explanations or interpolations may not be valid.
- It is likely that we can find a more refined way.
All in all, I would love to make people2vec, where we embed various psychological trains as vectors, as see which other parameters (scientific or not) we can reproduce. All in all, even IQ can be considered a personality trait (as it is correlated with other traits of personality, it is not a separate entity) http://blogs.scientificamerican.com/beautiful-minds/2014/04/...