It’s complicated too. My therapist said my mom seemed borderline, I took umbrage as a different kind of borderline diagnosis (childhood trauma) myself and said narcissist. My mom’s therapist would probably say ptsd because my dad has been abusing her for years.
Why were we diagnosing my mom?
Not sure.
We also diagnosed the potential partner I was interested in and that just made me feel suspicious and distant towards someone I adored.
Who benefits? Not me.