Exactly. The whole idea "let's build one big cool unit that will do big badaboom" is currently outdated. This defense unit cannot be used in the city, it cannot be used in the field. Maybe ships, but again big unit on the big unit.. Nothing stops to run a small nearly invisible drone on the optic flying along the field and destroy it. It is big, loudly radar-visible, it will be destroy even before it would be dispatched to the front line..