Yes but Fugitive, people play this game to become immersed in a WWII combat environment. By your line of reasoning, we could all be flying our planes underwater in the game, and they could all look like eels, because they are just pixels on a screen, who cares!
Your point about the lack of craters tradeoff is semi-accurate, however craters and shrubs differ in functionality. Shrubs and foliage are essential to remaining hidden (and thus succeeding) in a tank. There is definitive reason to get close to them. When getting close to them results in an atrociously unrealistic forced end of sortie, there's a problem there. It's certainly nothing like "learning to fly above the tree level". In a plane, there's little reason to get that low. In a tank, it is CRITICAL to be in and around these obstacles that are so...well, strangely deadly for some strange reason.
It's a problem that must be fixed, not simply adapted to.