I think it is useful, especially for beginners. Rather than having the photographer, in this case, a beginner, to keep trying various settings, why not give him some foundation?
In short, you allow the beginner to copy. Of course lighting conditions will be different, but most of the time, it will be roughly similar, so the photographer learns to manipulate from the settings told to him.
For techniques like panning. You can have someone who tries and fails all the time. Why not let the person know the settings, e.g. 1/15s ISO200 etc.. So the person has some idea on achieving a good panned shot?
If someone asks for the setup, say for a pic of an aircraft taken during an airshow, it will be useful to let others know of your focal length used in ur pic. Then others will know what lens they should get.