Submarines are unique in warfare in that they literally have a choice to lay low out of harms reach or press an attack and risk their lives. They are in either the hunter or hunted posture.
Very little grey area between the two.
So the subs commander disgression was / is the final judgment.
It can be pretty easy to sit behind a desk and say "Jack should be more aggressive. He let that convoy slip by !" While Jack is slogging it out in 12' seas limited visibility and gale force winds.
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