Having too many tools at your disposal, all clamoring for attention, can lead to confusion. During the Vietnam War, it is said that fighter pilots were so burdened with avionics technology and procedures and tactical plans that in battle, they often turned off all their alarms and devices, threw the book away and just fought by the seat of their pants. Concentrating all their efforts on what they knew how to do best, and relying on their instincts, was the best way to function effectively in the confusion of a dogfight.

Knowing the Germans, their battle plan was probably quite capable of dealing with anticipated battlefield confusion, but it still sucked them and the French into an abyss they could clearly see coming and could still not avoid. Their brilliant initial drive was stopped by pure chance, a lucky recon pilot caught them trying to outflank Paris, the French exploited their over-extended line, and the whole offensiive fell apart as they had to abandon the whole plan just to avoid disaster. From that momnent on it was a war of attrition. Throughout the 20th century, the Germans had the best army in Europe, but they could never win a war.

As for your last comment, I read once that the last thing a burglar wants to see when he breaks into a home is a dog. He may have anticipated and prepared for every possible encounter with the owners, but the beast is totally unpredictable.