German logistics and the Channel Islands trap

What changes if Germany has competent logistics in the Second World War?

Competent logistics would require a more competent state at every level. Over-fortifying the Channel Islands shows how strategic choices could waste transport and material.

German logistics cannot be repaired with a single technical adjustment because the failures ran through government and command. The Channel Islands show the strategic problem in concrete form. Germany poured resources into positions whose recapture would have required the Allies to stage a separate amphibious operation before invading France. The Allies had no reason to pay that price and could leave the garrisons isolated. Competent logistics also means refusing projects that consume transport, concrete, weapons, and labor without advancing the war's central objectives.