How is changing your resolution giving you an advantage? It'll make everything look better and (in theory) the windows smaller in your HUD. Since the HUD is customizable, you can get rid of any windows you don't feel are necessary defeating the argument that the smaller windows would allow and advantage. And for your fps, it entirely depends on your computer specs and the options you have available. That cannot be changed by the devs. Your FOV can.
And how can you NOT say that being able to see enemies "out of the corner of your eye" is
not an advantage? Does it screw up your models of how they look? Yeah. Is it wild/wacky/weird? Yeah. If you get used to it, would you be a more effective FPS player? Yeah.
Case