The reason the WoP/BoP maps are small are because a) it's for an audience who don't want hours of flying but mainly because they are based heavily on aerial shots and so are aimed to be as near to the exact look as the area would have been in WW2. I have heard people say the can follow streets in some of the maps to find their houses or their parents houses.
also I think processing power may be a part of it as well...
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