There is only one useful thing the Meyers-Briggs test does, and that is to promote an understanding that different personality types exist and can deeply affect how people interact with the world.

For actually sorting people, it's about as functional as a choose-your-own-adventure novel or 'Which X are you?' online quiz. I thought the categories were interesting, then looked into the science behind it, and found it isn't based on science, it's based on Jungian type theory.

Among many other problems, it assumes everyone is neurotypical.