WD and Air Bags on Rear - Why a No-No?

I like going down the road level. I hook up, doesn't matter how little or much air bags have in them. Then after hooking up I add air bags in order to level. And not so much predetermined PSI but level. Sometimes only 15 pounds other times 40 or 70 depends on how much stuff I'm getting hauled around. Having 3/4 of cord of wood in back end or just a BBQ makes big difference. I don't know why someone would not use air bags if they have them. People that are squatted down and have their headlights pointing at the sky makes me wonder. I don't know what I'm missing.

"there seems to be a chorus of folks who say Air Bags and WD systems do not mix". They mix with me and the "chorus" is out of tune IMO.