From what zet said, sighting could become much too easy, and may encourage camping, bad camping, as you are practically using a low-zoom scope. I think they are taking it too far with realism; the more and more you try to make the game realistic the more you could realise you are sat behind a screen using a mouse and eating bread. I sometimes eat bread when I play red orchestra.
NOW; to get down to the real techy stuff. Irl, you would have to eat. Now, suppose there was a map where the Germans hadn't ate for a long while and to survive they had to raid a Russian field kitchen. But, heres the problem. To stay alive, you have to eat, but while eating you are defenseless, so half the team would eat while the others would defend, while the defenders get steadily weaker from hunger.
This would require a good team to pull off, and adds a good deal of realism, as many of the German soldiers during the last stages of Stalingrad became seriously hungry, to the point where quite a few actually died. iirc, one German on a transport plane (the last Junkers 52 to leave the kessel) stole a loaf of bread from an officer, and devoured the whole lot. After a few hours, he got terrible cramps and died before the plane touched the ground again.
This would lead to an added layer of realism: if the germans eat to much, then they will go into "slow death mode" until they eventually die.
My point is too much realism is a bad thing. It makes things more complicated. "Focusing" means another key is needed; it encourages camping (it may do) and also, if you have the option to remove this, wouldn't you keep getting annoyed when people are zooming in on and you, and getting easy kills?
What I REALLY LIKED about Ostfront was THE COMPLETE LACK of zoom. If felt so natural, and long range shooting was difficult, but it just felt so good NOT to zoom in.
