For the most part the terrain in the game has had no real impact on game strategy and that’s a shame. It appears to me that most , if not all the maps in the game, have been provided by a community of players, I thank them for their a well done job, but they are armature map builders, not professional game builders.
I don’t know that the tools exists that would allow the guys building the maps to actually build a map with a bridge that spans a river. I’ve always thought that it would be great if a new type of troop was included in the game, an AI that repaired or built bridges or towns or airfields. So that when you destroyed buildings the Engineers would start to repair and rebuild.
That when a group captured a bridge, or town or base, they would have to bring in troops and supplies to rebuild that damaged base. Would slow down the horde and require a new strategy for base taking.