Also thinking--human is the optimum shape for general purpose robots because that's what we've built our world for, and that's a de facto standard. But what if there were a smaller standard defined and accepted by a consortium? Then a secondary market builds in providing extensions/skeletons/etc to the smaller form. "Human" just being another suit that this general-purpose robot can control. At some level just re-pluggable brains.
I'd imagine the skeletons might have secondary brains (reflex centers) for their particular skills... (walking, etc).
The future becomes very different very quickly. No?