How would history change if post-Dreadnought battleships, cruisers, and destroyers adopted automated twin-gun secondary and main-armament turrets?
Short answerThe heavier, more complex powered mountings would drive rapid growth in hull size because ships need greater volume and stability to carry them.
NotesAn electrohydraulic turret imposes different weight, volume, and stability demands from a manual or partly manual mounting. Applying powered twin mounts to battleship secondaries and to cruiser and destroyer guns would not leave the supporting hulls unchanged. The likely result is an early surge in ship size as designers provide the beam, machinery, and stability required by the new armament system.