I'm just a PPL, probably not the jet drivers you are asking responses from. But I've been in a sandstorm in the Iceland interior (in a car) and the visibility is literally only a few meters. I was driving very slowly (less than walking pace) when a figure loomed up from the dust about five meters in front of my car. Turned out to be a cyclist, pushing his bike forward through the sand that had accumulated on the road, virtually blind (he had his hat in front of his face). I stopped, he literally bumped into my car with his bike, then looked up and went around me. Surreal. (And he had a good 60 km to go to the nearest settlement...)
Later on, we came upon some gates we had to drive through. Since I wear contact lenses, my girlfriend elected to go out of the car to open the gates (while I held my eyes shut), I drove through, she closed the gate again and got in again (while I had my eyes shut again). Lots of sand blew into the car during these two brief moments where the door was open.
So in a full-blown sandstorm (and it doesn't take that much wind to blow up fine sand), not only would visibility below anything other than a cat-III landing, but from an average cockpit you would not be able to see taxi lanes, and ground ops will be virtually impossible.
That's without even considering the damage it could do to a jet engine or a propellor.