If you could properly diagnose everybody in the world, then most of the world's population will have some sort of personality disorder. Would they still call these behaviours "disorders"? I doubt it. Please read the Nature article "The hidden links between mental disorders" by Michael Marshall. Basically, all the medical professionals and researchers agree that there is no actual dividing line between any mental disorders, let alone personality disorders, because there is so much overlap between all the supposed unique symptoms, and none of those have any biological basis or links to other symptoms of that same mental or personality disorder. That's why no one ever gets diagnosed with just bpd, it always has to include other conditions as well such as ptsd, generalized anxiety disorder, major depressive disorder, biploar 1, etc., to encompass all of the problems you're having. Why? If there is no fundamental difference between any medical conditions except what was arbitrarily decided based on just observed behaviours of patients through an outdated ableist lense, why can't it all be because of one condition? Just because we can't identify something, doesn't mean we should accept whatever theory we currently have as fact. For the past few centuries, most of the women with bpd who existed throughout Western countries would've been diagnosed with female hysteria and probably tortured at some point by people who were convinced that their uterus was cursed or something equally idiotic. In fact, there was a push to eliminate the various categories of personality and mental disorders from the last DSM which was blocked by the health care corporations because that's how they get funded, so this would've been a dent in their profits. The only reason we label our aggression, mood swings, lack of motivation, suicidal ideation and so on under Borderline Personality Disorder is because of some greedy motherfuckers that could not give less of a fuck whether we lived or died. The more we focus on this, the less money is invested into studying mental illnesses and trying to find actual solutions. I am tired of watching so many people suffer.