motors....??? even if it is hydraulics it can be supplemented by motors for faster movement. have you not seen bostondynamics’ stuff? sure, massive robots cant move as fast without a stuffload more power, but it doesnt mean that they’re inevitably clunky. plus battery technology is improving a lot due to the potential demand for when electric cars and automatic driver cars kick off, as well as current demand for mobile industry
this, plus it doesn't need batteries right now tbh, the IC engine which was powering these mechs already would be effective at driving 3-phase motors for the arms and legs, but batteries would be better