Comment by pygy_

Psychiatrists are tourist guides for the Paris catacombs who try to get around using an underground map.

When you do cluster analysis of the symptoms of psychiatric patients, the empirical clusters don't match the DSM entries.

Schizophrenia is at least 8 distinct diseases (see GWAS), so orphaned that they don't have a name.

Psychiatry is an epistemic mess, and medicine uses it as a garbage bin for the patients it doesn't understand (because blissful ignorance is the norm over there).