I don't know about you, my eyes are good, but they can’t freeze frame, move images forward and back frame by frame or calculate angles.
So to support my coaching, irrespective of the standard of players, I use cameras and computer applications to support my players learning and development.
In the modern world there is no excuse for a coach to avoid the use of video cameras and visual feedback with players.
The technology is so easy to use and accessible. Yet incredibly powerful.