[danoh]

I voted "other" as the possibilities given overlook the fact that despite the many problems listed the U-Boat arm in fact did it's job quite well until long after the war was lost (Dec. 7, 1941.)

My "other" reasons are strategic. In both all the simulations I've played and in reality, Germany should have crushed Britian when she had it by the balls .

Germany could have also followed the historical path and beaten Russian with a more intelligent campaign in the east in 1941. In which case the U-Boat war becomes trivial.

Given the strategic decisions that were made, loosing the ASW technological battle was decisive.