I wonder if robots could be made to work better at cryogenic temperature, so superconductors could be used. The figure of merit would be much higher if resistance was zero. Or maybe this is another reason to want room temperature superconductors.
You would hit electrical steel saturation limits way before you need to pump in enough current to justify super-conductance.
Cooling in general is not a bad idea to allow you dissipate heat as you push motors to their saturation limits.
Even copper has vastly lower resistance when cryogenically cooled. It's not a bad idea for some applications, and water cooling is already a good way to increase power density.
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