You have taken one part of medical science and applied your findings to the whole of the medical science, both pure and applied. Thankfully these days medical and hospital treatment is not completely based on pseudo science otherwise treatments would not be successful.

The financial advice industry needs to move on from the excuse of 'past performance is no indicator of future performance' for the betterment of its future. There are tools and techniques in other professions that can be adapted or mimicked within the financial advisory ranks. In fact, that is happening. AI financial planning is developing example.