I was confining my thoughts to subs that saw service. Only a few of the many built were even close to putting to sea, right?
XXI was an amazing boat, clearly.
As for the what-if, I have no idea, but you are probably right that fleet boats would do no better.
Fleet boats would have to do MUCH WORSE, however to lose this particular argument, IMO.
U-boats operating in place of USN subs would do poorly in the PTO, while Fleet Types would likely do no better.
Note that long range---and long submerged range---combined with surface speed does directly translate into survivability when ASW doctrine revolves around saturating a cirle which defines the max submerged endurance of the target. Watch that circle, and the target MUST surface in time. The bigger the circle, the more assets required to watch it.
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