As a fan of psychology, psychometrics are really frustrating. IMO they are given way too much weight in pop-science. There are a number of subfields within psychology that are doing amazing work, building out theories of behavior, cognition, etc. that builds well on top of each other, inspire theories in different sub-field etc. But psychometrics fit nowhere. Personality types and IQ does not explain behavior nearly to the same extent as simple environmental manipulation.
A couple of examples: People are likelier to cheat on a test if there is a visible cheater in the room regardless of how you score on a personality test. And you are on average quicker to spot a red square among red circles if you have been primed to spot a red square in a previous round, regardless of your IQ.
IMO the whole field of psychometrics is a scientific dead end. There are use cases for psychological testing (particularly in neuropsychology and as a diagnosis tool in psychiatry), but in general these tests are there to support a theory, not the whole basis for the theory.
A couple of examples: People are likelier to cheat on a test if there is a visible cheater in the room regardless of how you score on a personality test. And you are on average quicker to spot a red square among red circles if you have been primed to spot a red square in a previous round, regardless of your IQ.
IMO the whole field of psychometrics is a scientific dead end. There are use cases for psychological testing (particularly in neuropsychology and as a diagnosis tool in psychiatry), but in general these tests are there to support a theory, not the whole basis for the theory.