Just to add, the most extreme version of this was probably the thousands of miles worth of defenses Germany built along the coast which diverted a great deal of men and resources without meaningful associated deaths.

The French resistance was again almost completely useless in terms of killing German soldiers. However, they had a more meaningful impact on German military effectiveness as demonstrated by deployment of forces.

To be clear, I am in no way debating the casualty figures, but winning a war isn’t just about running out of people. Militaries trade off between different types of resources.