LB,
I have no doubt to the veracity of the reason given for the relocation of GA parking and the reason for allowing class B aircraft there is likely around the assumption of increased weight of a class B aircraft and less likelihood of being blown over, (yes there were tie down rings, now since removed). LB your point is not lost on me, and as I stated to the MIA management fellow that explained this to me at the time,...how then due you mitigate the risk of a class B aircraft with gust lock left out or no rudder gust lock as is typical of many types not suffering control circuit damage if left parked aft facing to the jet blast? I could see he understood but was in a position of little choice.
Oh, and it's not ok for GA to park there unless class B, I do it at their wroth and only because the safe operation of my aircraft takes precedence, I just make sure I face west, there is still a huge distance between the jet aircraft refuel maneuvering area and the parking area.