I have so much to say on the topic that I probably can't fit it in an HN comment but some key points 1. Some personality testing is definitely pseudo-science. Some (big5, attachment styles, etc.) are empirically supported. 2. Often personality tests are used incorrectly. For instance, MBTI gets criticized for not being valid, but what does valid mean? If you're talking about a predictive validation study for something like hiring, then yes, it's not valid, but the authors would never have wanted it to be used for hiring/selection. 3. We see value of personality testing mostly in being (1) a framework to understand people and (2) a vocabulary to be able to describe ourselves and our intrapsychic experiences (3) a way to feel less alone/alienated in our suffering. For instance, if you understand that your attachment style (which is causing you suffering in your relationships) is common and mostly not your choice, it might make you feel less defective/alone.