At least for SMG players it pretty advantageous tbh. Seeing 30deg behind your normal 90deg vision can be very useful, you might see someone sneaking up on you or to your side faster when you shouldn't. Also in close range it makes dueling easier, imo. But the point is, is that if he has this fov, he has developer cheats enabled. That means he could toggle radar on and off to see where we are, use fullbright e.t.c. Usually one leads to other.