What changes if the Luftwaffe and Kriegsmarine cooperate effectively during the Second World War?
Short answerBetter cooperation would remove a recurring Axis handicap, because Allied services were generally more successful at remembering that they were supporting the same war effort.
NotesThe answer treats service coordination as part of combat power rather than an administrative detail. Allied organizations had their own rivalries, but they usually managed to support a common campaign. Axis services repeatedly struggled to share priorities and coordinate their separate capabilities. Improving Luftwaffe-Kriegsmarine cooperation would therefore strengthen reconnaissance, air support, and maritime operations even without changing the underlying weapons.