Make underground bunkers+big tunnel, which makes it easier for inf to move across and safer
Maybe even points underground (already have that in Blackcoast,Harju,Mestia and Belaya)
sure it will get superfobbed to hell, but you could add a lot of cover and with small tunnels that are good for flanking with a size of (like 2mx3m) and a main tunnel which would be connecting to every other underground place around the middle of the map that would be huge enough to fit fighter jets inside.
Maybe even ramps in and out from some hangers, so that you can fit light vics inside and drive them through.
Fallujah tunnel are very limited but they still give big impact if the team use them right, and they should put them in more middle eastern maps, like Mutaha, Al-Basrah and Talil outskirts.