Comment by modeless

I've wondered for a while why we don't use electrostatic forces more. Electrostatic motors and electrostatic speakers do exist but they are very rare compared to the ubiquitous magnetic types. It seems like it should be possible to make a really good electrostatic muscle for robots. I know that there has been some work in this direction like https://www.artimusrobotics.com/technology, but what makes it so much harder and less developed than regular magnetic electric motor technology?