The firepower and vulnerability of Japanese Battleship Number 23

How formidable would Japanese Battleship Number 23 be with twenty-four 16-inch guns and a speed of 30 knots?

It would be terrifying in a surface action, but opponents would avoid a direct duel and attack it asymmetrically, especially with submarines.

Twenty-four 16-inch guns in six quadruple turrets could deliver twenty-four shells a minute even at one round per gun per minute. At two rounds per minute, the total would rise to forty-eight shells, making a surface engagement extremely dangerous for an opponent. One suggested response combines several Allied battleships, but submarines offer an alternative to matching the ship's guns. A navy building something this large would have few examples. An opponent could operate elsewhere and attack the battleship asymmetrically.