I have specifically asked Rolex USA's NYC service center about wearing my watch while shooting, and specifically asked about weak hand only pistol shooting. They said that it would not be a problem, and that they generally want people to wear their watch without concern. They only thing they said to avoid are activities which risked direct impacts to the watch, such as contact fighting.
While shooting, your hand and arm will act as shock absorbers.
Shooting does not seem to be that hard on a watch. I would not be interested in wearing one which could not handle being worn while shooting.