I am confused. Are you saying that the problem is that snap views give an advantage because they give instant views that you cannot get with track ir and that if you use them in conjunction with track ir it breaks immersion because your view point moves outside of where it can be using track ir? And then further that the views obtainable without track ir should be more restricted than they are now with regard to head position?
With regard to realism, I am not a big video game player so other people may have a different experience but AH 2 is the only flight sim I have used that gives me anything like the feeling that I can look around like I can in a real airplane. I have only used MSFS, MSCFS, IL2, ROF, and X-plane. The reason is that AH2's view system, for me, is simple and intuitive and allows separate key/hat combos and the ability to save changed head positions easily with the F10 key, I feel like I can glance around without thinking about buttons.. I would have to use the other sims I listed again to really explain what the difference is. My memory though is of feeling alternately trapped behind a door pillar or trying to operate a security camera.