RV Anti-Freeze Freezes

I take one gallon of RV antifreeze, shove the suction hose into it, switch the valves from fresh water tank to suction hose, turn on the pump and walk around my fifth wheel opening the hot and cold until pink antifreeze comes out. I dump two gallons into the black and gray tanks as they are fully exposed. When I go camping I switch the valves to use fresh water tank and let the water pump out the antifreeze and camp just like summer down into the teens F. To winterize or unwinterize takes less then 5 minutes. I'm not sure why some folks make such a big production out of it.