I had a thread on INTJs here a few years ago. INTJs tend to be skeptical and logical, so it makes sense more INTJs would make their way out of the borganization.
shortcuts in getting to know and learning how to work with people
That's exactly what the test is, IMO, which has pros and cons. If you use it to stereotype or not hire people, that's a bad thing. If you use it as a tool to better respect and communicate with others, that's a good thing.
As a former behavioral health clinician, IMO, a good amount of psychology is soft science and pseudoscience. IMO most personality tests are just that. But I do respect MBTI because it is fairly accurate and is simply describing who you are and how your brain reacts to things.