Disagree
I agree Fats were to aid long range shots but disagree on your why. Type I steam torpedoes coupled with uboat optics & computer were quite capable of hitting a merchant at its maximum range of 12.5 km. Have done so in this sim on unescorted merchants.
But by mid war, even the greenest of destroyers would have heard there long run time, and radioed for evasive maneuvers.
Hence Fats were invented. Though it appears they werent to effective as uboats stopped carrying the Fats later in the war.
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