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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 go further to argue that it's very necessary for robots to have even more mobility such as wheels to take advantage of momentum and increase efficiency. There's a reason the wheel was invented, things like bicycles, wheelbarrows, etc.
The ANYmal wheeled legged robot is an example of that.
https://newatlas.com/robotics/anymal-swiss-mile-quadruped-wheeled-standing-robot/
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.
Good point well made. I hadn't considered that.