I wish we knew how to imbue robots with chemical actuation mechanisms that actually worked (as opposed to some proof of concept demo of a simple electrolysis reaction in a bulky 3D printed silicone balloon).

If real muscle cells / limbs serve as a sort of reference, they would be vastly more space-efficient, compliant, and have higher power-weight ratio than any electromagnetically actuated servo we have today.

It makes me wonder if the "modern" androids in Westworld used electricity at all.