Why should the AA be nerfed? Espexially in a faction with no pintle mounts
Quad is superior AA by a large margin and OP has suggested to become cheaper and available earlier.
Recently Bofors and ostwind were buffed because this exact gap and reason. AA Is no use if it doesn't take down a plane in first two passes
Bofors AA was buffed because its AA was 0.
I am not sure what buff in the ostwind AA you are referring at but is much more expensive than proposed quad.