Its a good rule for a good reason. After a typical jet (and just about any ROG R/C aircraft with trike landing gear) gets going pretty good on a takeoff roll, the weight on the nose gear is less and less in anticipation of rotation. This means that steering authority is rapidly going to zero. At the same time, control authority in yaw is increasing rapidly for the rudder(s). So if a gust of wind or a big runway rut turns the airframe towards the crowd, the only hope you have is rudder.