We do not use Mils in F-Class. Almost everyone (in USA) uses MOA reticles in F-Class.
The coach may put some "wind" on the scope to start depending on the wind speed and direction. I believe the coach had put 1/2 MOA right on my gun to begin with and then we were holding off as you saw in the video. There are times if the wind is howling, the coach may have 7 or 8 minutes of wind and then we may have to hold edge of the target if the wind picks up even more during the string, or hold off in the same direction as the wind if it lets up. The coaches do not like to make dramatic windage changes on the scopes during the string.
In individual shooting, where there is no coach, the same can happen. I know guys that never put any wind on the scope and are holding edge of target and even past that. I always try to put some initial wind on the scope and then hold off as needed. That could also be achieved with a scope that has mils on it as the user would be accustomed to that scope and know the various values. In the World Championship we shoot at 800, 900 and 1000 yards in one day. These are known distances and so we crank the elevation knobs and are ready to go.