These things change throughout history and cultures. In the ancient world, it was over the cliff or onto the baby pile. It was not safe to be "different" because the pack depended on one another.
Then, especially after WWII, no one wanted to be like the Nazis. Prior to WWII, the US was busily sterilizing people they felt were unfit. Apparently the Nazis liked our eugenics program quite a bit.
Fast forward and now the disabled are monetized to such an extent that it's quite advantageous for some cultures (like in the US) to dx people left and right.
But some DXes get a whole lot more Gvt Funding than others. Autism is a slam dunk. Grants out the wazoo. Schizophrenia? Eh, not so much. However, before the DSM the APA issued a manual with about two diagnoses. Neurosis and psychosis. These were all subject to the lobotomy later one.... Imagine all the grant money to lobotomize people. You don't have to imagine because it was a lot.
How Government Prolonged the Lobotomy | FDAReview.org
My point is, for long-termers, watch how your DXes change over the years in the wording. One dr might say you have PTSD, another depressed, another OCD but your heart drs all have the same dxs over the years. Odd.
Now check to see what illness get all the funding and see if you have a shift in your dxes toward those dxes. Example, did your OCD suddenly get put under the umbrella of your autism where once it stood alone and sad and got no help? Now you qualify for help. And so do the institutions dxing and treating you.
America will always dx and treat according to money $$$.
Follow the history of PDD, etc and NOS's which a Dr can mold any old way to fill an insurance requirement.
It's all about the money.