> It's hard for doctors to treat if they don't know what they're treating.

I think it is important to distinguish between:
1) The symptoms you experience and
2) The diagnostic category you meet.

Why?

- Because there can be more variation in symptoms between people of the same diagnostic category than between people of differen diagnostic categories.

- Because medication seems to help / not help according to symptoms rather than diagnoses

- Because more people meet 'not otherwise specified' than meet any one category.

- Because the average number of 'different' categories a person with a mental illness meets is around... 5.

- Because the diagnostic categories don't capture natural kinds and they are constantly under revision to better carve nature at its joints

- Because the diagnostic categories might be ditched in the near future anyway because they aren't a helpful unit for research (symptoms are much better)