uuuuuum...He isn't even asking for minor graphical things to be modeled, like others on here asking for shock wave cones, 3d people figures walking, etc etc.
This is an ACTUAL BUG that SHOULD be worked out. It is not minor nor trivial and it IS a central issue to the game. We're talking about floating vehicles above a wrecked bridge for crying out loud.
Missions and there outcome are altered heavily, for example, if the task was to destroy a bridge to prevent the advance of enemy vehicles/tanks/trains, they would still move across it, reach the target in which you were supposed to protect, and hit it. You'd lose the mission anyway! You'd always have to make sure you individually killed each vehicle!
Just wait, being BS being a heavily air2ground oriented game, this will grow to be a MASSIVE problem..