[WVoneseven]

I think currently the majority of terrain is designed to be hid behind in crouch and shot over as you stand... which is sort of realistic in that there is no efficient way to pop up out of a prone to fire (try yourself).
BUT THAT BEING SAID.
I believe prone would be a positive for situations lacking substantial cover as in a real combat situation. Say a TR or VS company is moving along a canyon road into NC territory and a recon ambush team of cloakers and LAs opens fire from the cliffs. Surely the weak pathetic victims should have the opportunity to dive cowardly to the sides of the road!!!. Of course the NC snipers would be laying in their positions as well!

If they can make prone work as a first reaction or preparatory action the team will have been successful imo.