Speaking as someone who invested a good chunk of his youth in basic neuroscience, I both agree with this and yet am uneasy about it. I think that there is a fundamental disconnection between the aspects of our discipline that seek this detailed sophisticated knowledge and those that pursue it for the sheer fascination of connecting deeply with the human experience. Put more simply, the low functioning chronic mentally ill guy I admitted last night doesn't give a whit about his synapses and "connectome"--he just wants someone to understand the depths of his distress and suffering and who wants to try to make it better. The psychiatrist who is really gifted at the latter probably isn't the one "pushing the boundaries of neuroscience".
This is true, but one of psychiatry's problems is that there remains a parsing between the two. They are not at all mutually exclusive; in fact, I think that they are inextricably linked. Obviously, the basic scientist psychiatrists represent small fraction of the field, but the work they do has an enormous clinical impact. The more we understand about the brain, the more we can truly empathize and offer hope to patients. I think Danny Weinberger serves as a perfect example- he saw many, chronic, refractory to treatment schizophrenic patients and knew that psychiatrists should be able to offer much more, and thus dedicated his professional life to exploring the genetics of schizophrenia because genes transcend phenomenology, represent mechanisms of disease, and reveal targets for more sophisticated, therapeutic intervention. In fact, Lieber has an entire division dedicated to pharmacotherapeutics.
Also consider the example Silkworth and AA. In the 1930s, he described alcoholism in a very elegant way by focusing on its mechanism rather than purely its phenomenology, what he then called the "allergy". Of course, we now know that the pathophysiology of addiction is not a Type 1 Hypersensitivity reaction, but the clinical description of an allergy is an exaggerated, pathologic response to an exogenous stimulus, which accurately describes the use patterns of the alcoholic/addict. The true mechanism, of course, is now well characterized. Dr. Silkworth did not have the luxury advances in neurobiology and immunopathology to understand the mechanism, but his description, which he derived through examining and questioning the mechanism, is correct. And regarding the original members of AA themselves, his mechanism oriented description was vital to AA in its early days and still serves as a crucial foundation to the 12 Step Program, which, as far as I can tell, is the only entity that offers a solution for why the person drinks/uses in the first place. Now, of course, we can educate our patients on the "allergy," but we can frame the mechanism in terms of brain disease.