It does not prevent vulching. If 3 planes are vulching, after they killed the bot AAA, and you shoot one plane down, then they shoot you. Did it really prevent vulching?
It took the guy in the field 1 second to hop in the manned gun, and shoot someone down, who spent 10-15 minutes already in a sortie flying to that base. The manned ack player does not have to worry about time. The attack player does. If I get one pinged death from manned act. I now have to fly all the way back to the base for someone who presented 0 risk, 0 time.
What is fun about this? You are 6K from a base scouting the field. A person sees the plane near the field on radar. They hop in field Ack 88, you get puffs 10 feet from your plane from a point and shooter, then you blow up before you can get to the base and Jabo. You just spent 10 minutes to die instantly by someone risking nothing. Or what, you go home to avoid any chance of getting puffed out of the air?
Look at how many people die from inaction manned guns. Look at all those sorties where probably at least 50% were pissed off about it. I see no reason for it. It does not promote action. It does not promote game play.