It goes pretty far, and it is amazing, but the limitations are real and are encountered even on seemingly "simple" transplants like a finger. Critical autonomic

It goes pretty far, and it is amazing, but the limitations are real and are encountered even on seemingly "simple" transplants like a finger. Critical autonomic functions, actually, may work fine, because they are more self-contained - the heart regulates itself, the gut in many ways as well, and many actions like breathing and basic drives are, to my knowledge, rather "standardized" between humans in the lower part of the brain. That's why we all have similar reactions to touching something hot or sharp, being hungry, out of breath, etc.