I bet they could have deployable fins and a guidance system, and make missile obsolete someday. It’s amazing, because anything you hear about is YEARS behind technologically. (Unless you are “in the know.”)
At this stage it is relatively useless. the mass that can be accelerated is small in comparison with say a missile. When fired the projectile can go all the way through an aircraft carrier, a 2 to 3 inch hole going in and a 2 to 3 inch hole going out meaning you have to be lucky to hit something vital otherwise you have done nothing affecting the fighting capability of the vessel.