I don't really think it's about catching outliers. With doctors it's about catching anything that isn't obvious. If you've broken a bone or have a tumor or on

I don't really think it's about catching outliers. With doctors it's about catching anything that isn't obvious. If you've broken a bone or have a tumor or one of the standard tests comes back out of range, their job is easy. If you haven't they're completely useless and will prescribe either an SSRI or a stimulant. Very many people have very many conditions that aren't trivial to diagnose and just get ignored. It's not because they can't, it's because they're not interested and resources aren't organized enough to be able to give the appropriate amount of attention to a person.