I don't think I agree with this. While medical diagnosis has often required some sort of overarching theory (which is usually advanced beyond our available trea

I don't think I agree with this. While medical diagnosis has often required some sort of overarching theory (which is usually advanced beyond our available treatment options), treatments (pharmaceuticals in particular) have most commonly been discovered empirically. If we were to wait for solid theory before using such treatments, we'd probably still be living in the medical stone ages!