Well, to be honest in the game AI subs cannot fire torpedoes, so I would not be surprised if this was a way to compensate.
I do not have a complete breakdown of losses by cause but british subs sank a non insignificantl number of italian submarines and affected their operations; indirectly they might have caused additional losses due to friendly fire. How would you feel if your sub could be, at any moment spent on the surface, blown out of the water with no warning but that offered by torpedo trails? That would be a non trivial constraint.
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