One study that directly compared a “type” instrument (the MBTI) to a “trait” instrument (the NEO PI) found that the trait measure was a better predictor of personality disorders.[5] Because of these problems, personality type theories have fallen out of favor in psychology. Most researchers now believe that it is impossible to explain the diversity of human personality with a small number of discrete types. They recommend trait models instead, such as the five-factor model.[6][7][8]
https://en.wikipedia.org/wiki/Personality_type

Personality type theory is dead. Long live the personality type theory.

Several pop psychology theories (e.g., Men Are From Mars, Women Are From Venus, the enneagram) rely on the idea of distinctively different types of people.
Enneagram is categorized under pop psychology?