Why no macroscopic electrostatic electromechanical parts?
Have you calculated the voltages you'd need in order to get the equivalent force or torque? It's much easier to build compact machines of equivalent power based on high currents rather than high voltages.

Making a machine compact basically boils down to being able to concentrate the field adequately. It's easy to concentrate magnetic fields by adding more turns to coils and using iron pole pieces to guide them.

There are analogous structures for electric fields, but a key problem is that air (and other dielectrics) break down under high fields, allowing the electrons to leave the conductors, which ruins everything. Even in a hard vacuum, spontaneous emission puts a limit on how strong a field you can develop.