That doesn't apply in the field under combat conditions where soldieres are doing their best not being seen by using camouflage and terrain.
Due to the games fast turn rate the relative small FOV doesn't matter as the player can scan the entire 360 degrees in a second or two negating any negative feature of the lower FOV at higher zoom. Zoom plus high turn rate gives players a higher situational awareness than no zoom and the same turn rate and much more so than in real life under combat conditions.
You're really going to say that having a narrower FoV than real-life, poorer detail resolution than real-life, complete lack of peripheral vision rather than the simply decreased peripheral resolution you get in real-life, and the need to turn your entire view to scan over the same area you could see naturally in real-life, somehow results in better situational awareness than real-life? Every single aspect of vision in-game is worse than real-life, with the trade-offs that have to be made to portray the scene on the technology we have now. The benefit of zoom is that we get to choose which trade-off we want at the moment.
Look at a german machinegunner behind the emplaced MG34, that gun is approximately 1,2 meters long and it is clear that the soldier behind is only just slightly taller than the gun's length.
With his knees bent, body is bent forward, and his head lowered. Try comparing him while he's standing up. Better yet, find an example from the actual game, rather than stills produced pre-release. There might be a few objects that are off-scale, but in general it's pretty good.