I think the food supply idea would limit some aspects of the game (as previously mentioned with the storage facility being destroyed), like having that food supply limit the amount of units you can have. But the animals and other aspects of the environment would create a much more realistic experience when playing the game. Birds flying away when troops are storming their way, or having the already-present animals move more realistically. And as a comment, the first time I saw the elephants move in-game, I thought it was funny how they just float/drag themselves around without moving their feet.