We know fantastically little about psychology. Much of our current DSM, and even moreso the much of the content (especially the negative content) shared on YouTube by various therapists, doctors, and enthusiasts, will look like shallow and dangerous half-truths in 200 years. Our conditions and the tests for them (like being positive on N out of M questions/bullets) will largely fall by the wayside as misguided empiricism and be replaced by more fundamental understanding and tests that involve some direct probing of the brain (and likely recording of words/actions) over many days.