Incorrect maps have directly affect to strategy of the game.
remember that the game is just a game it can not live up to 100%
realistic standards. one problem is that units have predetermined
pathways and thus limited to map strategy.
another is to also have to edit the range of each unit from example 50km for artillery would have to be reduced down to about 9kms. All of these would make the game last much longer than what it currently is.
games can get around realism to fit what is needed. this doesn't affect strategy for the game as you are dealing with the game. the only affect of the "incorrect map" is that it is not realistic.