As for DSM politics, it's very clear that whole process is deeply corrupted with drug company money. It is not a scientific process at all. "Mental illnesses" are added or expanded in every DSM revision purely to expand drug markets.

Usually what is happening is that a pharma company has an existing product they would like to be able to sell for a new, currently unapproved, use, so they wine, dine, and pay huge "consulting fees" to psychiatrists on the DSM committees who then vote to approve the new use for the old drug.

Pharma companies are not actually making new psychopharmaceuticals, just figuring out new ways to make money with the ones they have, and bribing psychiatrists on the DSM committees to approve sales for the new diagnostic categories.

The complete corruption of this process and the loss of all claims to scientific rigor was another reason -- and an important one -- why the NIMH pointedly turned its back on the DSM.