Here is the thing: It's a game.
Realism isn't fun, heck, war is mostly about waiting around and the rest is crapping your pants and trying to stay alive. There are niche games that cater for that genre, the ARMA series for example, but it is what it is: A niche game.
People want fast paced, fun games. They don't want to be punished for having fun, and a virtual life isn't as precious as a real life.

At the end of the day: Games are just games, and most things concerning realism are absolute boring.