Capships, increasingly slower fighters? Or strategic weapons?

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Battleships don't need fast firing, low damage and low range weaponry. Remember they can only target one thing at a time.

What about shotgun esque weapons? 4 of them on a battleship say. One for each side. Have them cover a wide arc of the ship but still leaving small gaps. You can have shots that do spread out like shotguns easily btw.
Battleship is fighting a carrier for example. The carrier stays out of the battleships main gun range but the battleship moves to catch up etc. However bombers are swooping in on it. Inbetween firing it's major weaponry the battleship switches to another weapon group and simply hits the 'Fire all weapons' button. This fires all the highlighted weapons on the list (The weapons group switching is needed for it) and effectively produces a small wall of hurt all around the battleship in close range.
The battleship wouldn't be invincible to bombers (Though they tended to be in WW2. Took huge numbers and lots of tries to take down serveral battleships) as they could still effectively swarm the battleship and pass through the wall of pain, plus the weak spots on the ship would be vital.

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