A battleship without escorts is a big expensive target. A battleship with escorts is a massive expense for a dozen mile radius of "fire support".
Modern amphibious forces have amphibious APCs, helicopters, drones, hovercraft, satellites, aircraft, and cruise missiles. No one is going to storm a beach with unmounted infantry in plywood boats anymore. Pounding a beach and a few miles inland with 16in shells isn't worth the effort.
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