For some people these diagnoses will be a very good fit with clear predictive outcomes. But many of us have a grab-bag of traits from several categories and still mostly get along in life, maybe with some assistance particular to one of these diagnosis but no more help overall than anyone else needs otherwise.
The diagnostic models suck. They are too broad here, too narrow there, misunderstood by professionals. I had a psychiatrist (mis)diagnose me as bipolar based on a 45 minute appointment when I was in some sort of crisis in my early 30s and that ended up haunting me years later when applying for a job with a security clearance. I didn’t even know about it at the time. This was one of the top rated doctors in a major metro area. What a sham.
The field is a mess. It has a terrible history of horrific abuse. Some autistic children still receive involuntary-to-them ECT. I think we should be supportive of research into these topics while also being critical of the very obvious problems with them.
Adults too; ask me how I know.