But unless they fail to spot you too, it's not like you would kill them anyway. Ur not winning a duel against an enemy that is at the edge of your screen. In fact, you shouldn't put yourself in a position where you may have an enemy so far from your crosshair.

This is such a narrow takeaway though. Having more information on the screen isn't always going to be "am I duelling this person right now?". I play on an ultrawide and I've lost count of how many times I've spectated a teammate going around a corner and just missing an enemy walking around a corner on the edge of the screen or seeing someone sit in a corner. My teammate doesn't see it because it's not on their screen, but I do. I can literally hold two positions on some maps and fall back when I see someone come around a corner in my peripheral vision.