The inference from both myself and David was that you do know the other guy's game. If not then any such information is worse than useless. Believe me, if you know his game, then you CAN extrapolate and apply it to yours, especially for helping to judge wind or elevation adjustments. That can be very useful information and can give you a significant advantage.
If you're not paying attention to what the other guy is doing, you're missing information that may help you. As always, it's up to you to filter the information and decide what is useful and what isn't.