Yup. It adds to the difficulty because it means you have to hang around longer to ensure that your target does actually go to the bottom. That makes you vulnerable to attack from escorts etc. You may have noticed that once you've hit a ship, your "detection meter" goes into the red and stays there while you're in the vicinity of the target - aka being a sitting-duck.
If you play safe and sail out of the area, there's a chance that you'll lose the renown for the sinking because you're over a certain distance away when she actually goes down.
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