I also think that having more information about an entry can only help one in the sense that it will enable the judges to calibrate or target their senses to that particular element in the entry. Perhaps the "more is better" approach prevails in this case. This will also cut down on the time it takes for the judges to hone in on the flavors and allow them to actually qualify those flavors in the entry.
If you're looking for judge feedback, Bluesman is dead right on this.
If you're looking for medals, I think Jeffy has summed it up. When judging, you look for things that should/or should not be in the beer (whether this is info in the style guidelines or provided by the entrant). When you list a fruit, spice, etc, the judges are going to be looking for it. If it's not detectable, or identifiable, the judge may very well downgrade his score for that perceived lack.
Most of us realize that a listed ingredient can be at a low level and still make a subtle contribution. Fruits, spices, etc can combine or modify each other. The sum of the parts can be greater, etc etc. But for competition, if it's not discernible and/or identifiable, you run the risk of getting scored down. If it's a blueberry mel, most judges will look for blueberry, etc. Best just not to mention it if the average judge wouldn't be likely to detect it.