I agree with the overhaul part, but some things need to be categorized so people can be helped.
1+1=2, people with borderline personality disorder have trouble maintaining relationships, people on the spectrum have issues with social cues and empathize differently, and people with dyslexia struggle to read.
Those aren't good or bad things. They just are. And it's important we recognize them. These diagnoses doesn't create the symptoms, the symptoms create the diagnosis. The symptoms are there whether you ignore them or not... and to even be classified as a disorder, something needs to be hindering your life in some way.
My mom always disregarded my worries about being different with "well we're all a little crazy/different" and I think that was just her way of coping without identifying that she may also need help (psychiatry and psychology and the stigma in general we're not great in her day). I wish I'd been helped sooner, because the difference between me with medication and me without is absolutely night and day, to the point where anyone that catches me on a day I forget to take my meds is insistent on asking me what's wrong.