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The point of a humaniod is compatibility with systems that have been built for humans, which is...nearly all systems that have been built. Environments and tools that exist in the world are ones that have been built for humans, so for a single robot to be able to interact with almost all of those, that robot needs to be shaped like a human.

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My dishes were designed for humans, but my dishwasher handles them just fine.

Okay, maybe that's a special case. Maybe we should think of a task we haven't solved yet, like folding laundry. Why would a laundry folding robot need legs or a head? Why limit its arms to articulate only at the wrist, elbow, and shoulder? Why limit it to only two arms? Five fingers?

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