Smoke generators would be wonderful if you didn't show an icon while you were in a smoke area, but the big red "kill me I am here" over your head makes the smoke kind of worthless vs aircraft. I will lay a load of LVT smoke on a beach to try to cover the landing craft, but it is of no use when that red tag floats over you. If smoke hid your icon and make them have to come in low to find you it might be different. In that case I would want smoke for the 5" guns on the ships as well.