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Boston Dynamics introduces a fully electric humanoid robot that “exceeds human performance”
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
I'd argue that the wheel was invented not because "walking" was inefficient, but because flesh is weak and gets tired.
A robot doesn't have that weakness. It thinks nothing of running five hours at high speed if necessary. It has no need of wheels if it can just Gump it cross country with cargo on his back a la Death Stranding.
Robots have battery capacity limitations, they get "tired" in a different way. Your claim is true if you invent a battery that never runs out of power.
But does walking necessarily use more energy than rolling?
Good point well made. I hadn't considered that.
From the moment I understood the weakness of my flesh it disgusted me
I craved the strength and certianty of steel I aspired to the purity of the blessed machine