I am not claiming any specialistic expertise in Psychiatry. In the seventies we learnt mainly from the books from Prof Rumke[Utrecht] -who was considered an international giant,I think about endogenous and non-endogenous depression. Biological pharmacology was hardly developed yet

Over the many years, there have been many “reclassifications” probably influence by the pharmaceutical industry.

The article below gives-seems to me[even if I read through it very quickly] a good oversight of history and why long clinical experience should NOT be ignored.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3712975/

https://pubmed.ncbi.nlm.nih.gov/24366831/

Background: Now that we are in the DSM-5 period, interest in the older psychiatric literature seems to be gradually waning.

Aim: To provide a brief survey of important books by Jelgersma and Rümke, to show how these authors were influenced by Kraepelin, Bleuler, Jaspers, Lombroso and Pavlov, and thereby demonstrate how the older literature helped to shape the development of psychiatry.

Method: The study is based on a selection of the older psychiatric literature in book form.

Results: It is evident that even today much of the older literature is still influencing current concepts and descriptions of symptoms and the development of concepts such as schizophrenia, and is still guiding psychiatrists on the best moment to begin psychiatric treatment.

Conclusion: The older psychiatric literature should not be forgotten or overlooked. It is an invaluable source of in-depth knowledge about psychiatry