Interesting to note is that FPS games can theoretically support that precision. Since the smallest in-game unit of measurement is about 1/10th of a pixel on a 1920x1080 display, or 0.005493 degrees. It's derived from the integer value 65536.Thank you, I learned something new today! Always appreciated!
360 degrees is divided by that value to convert it into a measurement that the game can understand. Noone has felt to improve it since it's pretty darn small. If I wanted to use that smallest unit and keep my current sensitivity of 22.6cm/360, I'd need a 7200 DPI mouse. But then you have max tracking speed issues. :/