(Psychologist here, also highly cautious, to the point of being skeptical, of diagnostic labels)

Was there anything specific in the article that you thought represented overthinking? I thought the author did an excellent job. In fact, it helped me understand a borderline relative in considerably more depth.

I know in the US we psychologists can go overboard trying to prove we rely on "evidence based research" - but the best counselors I know always ground the research in lived experience, beyond all categories and labels.