At first glance this seems crazy. But what a battleship with a gun so powerful, that it can shoot down everything. Having a nuclear powered vessel that can shoot a railgun and laser might be battleship in size
A new surface vehicle for naval warfare is absolutely bonkers in the modern era. Even in the littoral space where notionally you don't have the depth for a sub-surface launcher, the LCS project was a complete bust. For anything in deep water, a submarine platform is so much more useful for projecting force and not a sitting duck.