That is because you are a submarine not a gunboat. Your gun is mounted on an unsteady platform, your crew is not trained to surface ship proficiency with your weapon, and the armed surface ships have at least two guns to your one. If you find yourself in a fair fight you haven't planned well enough.
AA guns are for sampans, not aircraft. Your 5" or 4" pop gun is for undefended, already wounded merchants and sampans.
You wouldn't expect to fly after an airplane. Don't expect to have a gun battle with a warship, or even a gun battle with an armed merchant. Submarines have the advantage against these surface ships. Why would you willingly give that up unless you have a burning ambition to be commander of a turnaround crew at Pearl? Or fish food?
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