Another advantage is that pork will sometimes wad up on the hook point and cause you to miss a fish on the hook-set. But that's not an issue with soft plastic. The hook point will go right through the plastic. Ohio pro Joe Thomas still relies heavily on pork trailers in his jig system - particularly a No. 1 or No. 11 Uncle Josh pork frog.
Fish hold on to it better, and it's always pliable.