Our bodies are extremely powerful and versatile. If we actually understood how they work and how to build/modify them, we'd get way more mileage out of them than an electromechanical alternative.

Imagine a body with perfect physique, maximum strength, a bigger/denser brain, programmable immune system, etc. It could even be adapted for deep sea or outer space life.

We haven't even begun to understand biotech at this level, because of moral/ethical concerns and a general aversion to anything organic (understandable, experimentation with sentient life is seen as bad, and our primitive side rejects most foreign biomatter altogether).