It's not always so black and white. Monoamine oxidase inhibitors for instance can boost all those capabilities in older people, but in general my experience agrees with yours. For reference I've tried what I feel like is every single psychiatric drug (over 200) with numerous combinations of natural supplements. The fact that I never got it right tells me our understanding of the brain is pretty poor. There's a drug coming out next year (rapastinel) that is the first drug in over a decade to actually do something different. I've got my eye on it.