The power requirements are very large for electric propulsion. It would be hard to generate enough electricity to have a good power to weight ratio. For a engin

The power requirements are very large for electric propulsion. It would be hard to generate enough electricity to have a good power to weight ratio. For a engine with similar thrust to the Falcon 9, you need ~186 gigawatts of electrical power (a significant portion of the US power grid). To generate that much power, you need a rocket engine, which defeats the purpose of going electric. The main advantage of them is that you can run them for a year or two before they develop issues and they use much less propellant. Typically they are used as station keeping thrusters, where you don't care about the low thrust they generate.