I`d like to see diverse bases on the same map - so far, on a given map, each type of base has just one appearance.
Think small, medium, large airfields with concrete runways, levelled dirt, grass strips. Mix & match fields build from Hangars, wooden sheds, fuel trucks, fuel bunkers, piles of ammo crates or pits dug into the earth.
Vehicle bases in small villages, makeshift ones with trucks and tents in a forest, camouflage netted camps in the desert, tunnels dug into mountainsides.
The same type/size of base/field could have many different appearances and layouts - Hangars on one med field might have different positions or numbers (cancel out advantages with hardness). Runways that don`t always have the same orientation.