"Just need some breakthrough materials to work" is the kind of "just" that stops things dead in their tracks. So far, the game in town has been primarily hydra

"Just need some breakthrough materials to work" is the kind of "just" that stops things dead in their tracks. So far, the game in town has been primarily hydraulics or electromagnetics, and the things that replace them are better hydraulics and better electromagnetics. Alternative actuators are either super niche or fail to leave the labs.