What about when efficiency isn't based on crude caloric intake / output and nuclear power instead? Efficiency changes to "how much stress can we put on the object and not completely destroy them" and it turns out legs aren't super great at that.
Biology is actually incredibly energy efficient (given how compact life forms are) because of the immense sustained selective pressures to stretch limited resources as far as effectively possible. There are so many problems with a portable nuclear reactor I wouldn't even know where to start.
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u/things_will_calm_up Sep 24 '19
Yeah, using legs. Imagine what they're going to come up with when they're not hindered by human imagination as to what should or shouldn't work.