Even late in the war you will have times when you wished you had it. You've crippled a merchant or two enough that their speed is 0 and its obvious that they're not going to sink given time. After waiting for the escorts to leave going 2,000-4000 meters away is safe enough to use it to give em the last little nudge they need to finally go under. Since you don't gain anything by removing it, no reason really to remove it. Its like a snub nose screwdriver, very rarely need it but in situation were a normal one won't work you thank god that you got one/kept it.
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