They can’t be used for moving targets but for infrastructure they can be effective. At the cost of only a few artillery shells send 10 and maybe 3 will hit.

Another advantage is because of simplicity and cost it allows quick iteration and adaptability. Use honeycomb patterns to lower radar signatures, use specialized antijamming gps/glonass antennas. Engine is too slow? Add a small turbojet. Color too light and visible at night? Paint it gray, etc. That can happen at the speed of weeks and months. Try doing that with Tomahawks, artillery pieces or HIMARS.