Myers-Briggs is just about as unscientific as it gets. Neither Myers nor Myers-Briggs (her daughter) had any formal education in psychology or any serious experience. Their personality types are based on Jung's ideas that are over a 100 years old and have been long since discredited. There are no studies that confirm that MBTI type is predictive of anything. There are studies that seem to confirm that the dichotomies used in MBTI might not actually exist. Et cetera.
Thanks for the clarification. I actually had the Big Five in mind - somehow I confused that and MB. Even there, I don't really have any idea if Big Five is "true" (stable and/or predictive) or not, I'm really just listening to Jordan Peterson here.
Before you invest in the Big Five, you'll want to check on how much it can change your posterior odds, and compare that to results of investing time and money into other approaches.
