They are much more predictable, well understood and easier to dose than the chemical cocktail of natural compounds. Please note that I am not saying that there aren’t any useful natural medicines. I am stating that it is better to isolate the active components.
Of course, I’m not delusional. And I’ll gladly take those pills I get recommended by the doctor or pharmacist. But if I got recommended 2 types of medications as options and one is natural based, I tend to pick that.