Comment by belviewreview

The basic problem is that human hands are made of flesh, while robot hands are made of artificial materials like steel and carbon fiber composites. Flesh is a million times more complex, starting at the molecular level, and so it can do all sorts of things that artificial materials cannot.

Compare for instance a jetliner and a bird. The jetliner can fly fast and carry a lot of cargo or human beings. The bird is a lot smaller and slower, but it can do all sorts of things a jetliner cannot. This includes growing itself from a single fertilized egg, self-repair, defense against attacks of various types, finding and getting food, building its own shelter, and reproduction. All because it is made of biological cells. And note that for a jetliner, the similar tasks are carried out by human beings also made of biological cells.

I think a similar analysis explains why artificial general intelligence is impossible.