My theory is because most sci-fi enthusiasts are not biologists. They simply do not understand how powerful enzymes are and prefer to think about synthetic nan

My theory is because most sci-fi enthusiasts are not biologists. They simply do not understand how powerful enzymes are and prefer to think about synthetic nanorobots instead. Plus it sounds cooler. You don't need to reverse engineer your entire body to understand a single enzyme. We do it all the time in biology. Furthermore, even if you create something that goes haywire in an unanticipated scenario, your body has good defense mechanisms against biological abnormalities. It doesn't know what the hell to do to quantum dots or nano-scale inorganic materials