Britain only reluctantly ceded submarine parity with Germany in the London Naval Treaty as a desperate act of appeasement meant to buy time for her own rearmament schemes.
Does anybody really think they would have sat idly by while German shipyards cranked out a program for 300 boats by 1940?
Producing 300 U-Boats in five years from scratch has a great deal to do with technology (conventional building techniques could not do it and Germany had no experiance at modular shipbuilding), economy (even in Nazi Germany things needed to be bought and paid for and cash was finite) and strategic priorities (the workers and steel needed for a 300-boat building effort would have raped the Army's rearmament program and plans for motorization and panzers let alone what it would have done to the Luftwaffe's wish list).
Of course everyone is forgetting that the Kaiser's U-Boats ultimately failed and made Germany's situation (arguably) worse in 1918 and so selling the land-minded Hitler on a repeat performance from the start was problematic even if the other insurmountable problems acquired solutions.
Everything Hitler wrote about in Mein Kampf pointed East and involved a neutral or even an allied British Empire. A 300-strong fleet of U-Boats would destroy any chances of keeping the peace in the West while contributing nothing to the acquisition of Living Space at the expense of Poland and the Soviet Union that was Nazism's centrepiece agenda.
Without context and balance any "what if" on the Internet quicky degenerates into fantasy worthy of dragons, Middle Earth and magic rings of Power.
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