There’s functionally no engineering reason to put a robot on two legs. Every other form factor is cheaper, more stable, more efficient, and easier to maintain.
There is, however, a very good marketing reason: everyone’s watched Terminator, fear goes viral, and anxiety drives attention.
A warehouse robot is infrastructure.
A humanoid robot is an engagement strategy…
Aaakshully
Two legs makes sense.
1. Minimum suspension mats (vs tripod or quad+)
2. Nature doesn't do wheels.
3. There are other ground propulsion methods (wigglies etc) but not fast.
4. Once you got the balance software going, legs are super fast.
5. You could have alternatives, but they are medium specific (arboreal, hydrous), legs are universal.
6. Flight has specific downsides mass/energy also medium specific
Just about the only half decent alternative is snake.
But legs > snake
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