300 is not the limit, and as far as they’re concerned the more consistent their game is when there are thousands and thousands of dollars on the line the better, also you said it was just to look “leet” or because they’re used to it

Playing in 4:3 nearly doubles your fps

No, the higher the fps the lower the imput lag and the smoother the game feels because a frame is more likely to be rendered closer to when the monitor can display it meaning it's more accurate