The differences I think it would give would be ambience and also it would be harder to kill than an ack gun.
Wiley.
Also they would, I assume, be randomly re-deployed and camouflaged on base capture so they can't be memorized or mapped like standard field ack.
Might be interesting and force players to work together. Bring in a Storch to search and mark the emplacements before the GV rush in, or take your chances to trade off speed of attack? All kinds of fun complexity.
But, yeah, you could do all the same with randomly deployed, camo'd 88 emplacements, they just would be as hardened. Can't we have both?
Also, I would just love to see the AI GV problem solved in general. SOOOOO many fun possibilities for missions.