I think the idea behind the head bobbing is that the game is doing for you what your body would be doing in reality.
Your eyes still focus on one point on the screen, the screen just happens to be bobbing like your head would be. It's basically the same effect. I thought the way it was done in Ostfront was very nice and the preview videos for HOS seem to have kept that level of screen movement.
With the bobbing camera, our "sensory gyros" can kick in, even in the comfort of our office chairs.
The problem is that your physical eyes notice this head bob on a computer screen far more then you would in real life, mainly because the screen isn't attached to your brain and it's putting in an automated/simulated body motion you're not connected to.... thus harder to focus on then what would exist in real life.
Since someone's own/personal head bobbing is subjective based on neck muscles, height, posture, eye strength, how they run, etc.... one pre-set style of head bob may work for a few people, while others would think it's too much or too little. This is why I believe it should just remain out of the game, or leave it as it currently is.
Our sensory gyros can indeed kick in from the confort of an office chair but if our gyroscopic sensor doesn't feel anything (like if we do not move) it will not feel any need correct anything.
Aka the image point you're looking at on the screen, if that moves around it can be hard to keep track off. While you can move your body pretty wild and still be able to read text.
Thats why especially angular movement of the camera can be really hard to keep track off and lead to motionsickness as well.
Ah, that's what I was touching on in what I mentioned above.... motion sickness.
I have found over the years, through my own personal experience growing up and what my wife has gone through up until just a couple of years ago, that motion sickness/car sickness is based on eyes that have weak muscles that have a problem focusing on moving objects.
I grew up having a lazy eye I am told (everything is 20/20 with no glasses now) and my wife had an issue with her left eye straining more to focus then her right. Because of this, long drives, staring at a computer screen for long periods of time or a movie with quick flashes or blurry motions would make her sick or give her headaches..... once she got glasses for this, all her motion sickness issues went away.
Now how this relates to the topic is that we're not the only ones who had issues with our vision and many more around the world still do..... and thowing on more motion blurs, head bobs and other things to visually alter what you see in the game for fancy effects will only cause more headaches.... litterally.
I tried playing Resident Evil 5 on the PC a couple of days ago and I had to take the blur off because it was so intense and distracting I couldn't play the game and started getting headaches after about 10 minutes.
Artificial Head bobbing is simply not worth it and it adds more strain on the viewer's eyes then needed when it comes to continually trying to focus when what you're trying to focus on tries to artificially unfocus on you..... not healthy for your eyes in the long term.