In Doulas MacArthur’s memoirs, he maintained the Maginot Line was an offensive device. It freed the maximum number of troops for the attack. In memory of the “Miracle of the Marne” attacking with elan was supposed to be how the French would deal with the Germans in the next war.
Somehow that concept didn’t work. It could have been related to the fact that of a 39,840,000 population, 4,375,000 Frenchmen ended up as killed or wounded in WW I. Today taking into account the emotional trauma to relatives, we would probably say almost the entire country had PTSD.
MacArthur bi-passed as many Japanese positions as he could manage and it saved many American lives. Thousands of Japanese corpses were found on some islands after the war. They had starved to death.
Yes, WW II was horrendous. Churchill and many of the British High Command were initially against what was to be the Normandy invasion because they were sure that trench warfare would be repeated.