It's a GAME of course BUT
Sorry, no they do not affect the strategy unless you're trying to equate what you're doing with realistic map. The strategy within the game remains the same WITHIN the confines of the game. i.e. If you're playing as France and want to take over Great Britain in a 31 player map you need to make sure you can land on their shores safely. This means being able to bombard via guns, ships or planes. Now going back to WW I, that was impossible to happen because France and the UK were allies, so, the map accuracy has no bearing on the strategy of the game.