That was my point precisely, which you got. My thinking was that cluster bombs, or bomblets were the ultimate anti-personnel weapons. They do not have sufficient explosive power to put holes in runways. They will decimate airplanes with thin structures, but are not effective against armored vehicles. In vietnam we did have some airplanes that carried WWII bombs that contained numerous fire producing clusters of the kind used against Japanese cities, and were great at area bombing at night, when the aim was not near as good as day time.
Comments based purely on memory, and not recent research.