On the other hand, temporary overheating is a major concern from a safety point of view.
Your brakes work by converting kinetic energy (movement) to heat. In the process the brakes can get VERY HOT as they can only dissipate that heat at a modest rate. When brakes overheat they lose efficiency. In other words, it takes more braking effort for hot brakes to scrub a given amount of speed than it does for cooler brakes.
Further, if that overheating gets severe enough it will no longer be a temporary loss of efficiency as they can bake and glaze into surfaces that are permanently less efficient at doing their job