If you are saying that a photographer is only very good when they can communicate the exact meaning of their photograph with the photograph alone?
If so, I quite disagree. Every viewer of a photograph brings their own unique vision and maturity of vision to viewing a photograph making the experience and the interpretation unique to each viewer. Feelings also get involved when viewing a photograph and these are unique to each viewer. There for, it is nearly impossible to communicate your exact meaning without influencing their perceptions by an obvious descript title or story, i.e. photojournalism.
Another example is, if you have a photographic assignment. There are certain parameters put on it: the topic, idea behind it, possibly a subject, etc. The people involved in the assignment are aware of what the person is trying to communicate and then one can judge it to a certain degree. Take the same photograph and let it stand on its own outside the group, and the interpretations will be vastly different the majority of the time, some will be close, but never an exact meaning.
Too bad this discussion will be buried in this thread...
JC