I've never seen billiard flat "natural" fields either and absolutely agree that infantry and low profile weapons can be hidden/blended just about anywhere, those little furrows & burrows youre talking about. But a soldier is flexible, (bends to fit), and very small when prone, so can do that.
My point is about TALL hardware - if the landscape is devoid of buildings, trees, incredible tall grass, banks, holes or any other significant feature, you havent got many ways of disguising a medium tank, AA gun, howitzer, ... etc. And if a Sherman is disguised to look like a haystack etc, then you would in reality be able to see "the haystack", then decide what to do about it, which of course is beyond any games similar to this (thankfully). A single haystack in the middle of an area of uncultivated land might just arouse a little curiousity?
This says bit of video says so much ... cracks me up everytime :-)
http://video.google.com/videoplay?do...70357062149413