But at the same time the motor is extremely finicky/fragile in the source of energy (negentropy) it will accept, while natural life is extremely hardy and adaptable.
I wonder how much of machine-like "efficiency" is actually "overfitting" at the cost of robustness.
That is a fair point to be honest! I guess when you a 20min lifetime you can probably compromise on reliability in favour of extra efficiency
The need to reproduce and repair our bodies is a big trade-off.
Electric motors are sort of like hermit crab shells - Hard and long-lasting, but they only exist because they piggyback off of a living species.
For more complicated organisms, robustness comes in the form of cellular turnover, and regenerative healing in response to injury, at least in youth. I wonder though if single celled organisms have or even need such a function.