Well, not "all" of us - people who know about experimental psychology and cognitive science (and statistics even) have known that the MBTI is pretty much pseudo

Well, not "all" of us - people who know about experimental psychology and cognitive science (and statistics even) have known that the MBTI is pretty much pseudoscience and bunk. It's great for post-hoc rationalization of your feelings, and decent for communicating ideas about personality to people, but the actual four-factor with subfactor test is snake oil. Business executives like it because it feels science-y, and business people love metrics, even if those metrics are ultimately meaningless. See also: almost every business "reform" in education.