This is just a guess, but it seems like the judges have developed, over the life of the contest, a shorthand series of words, phrases, and statements -- macros, if you will -- for evaluating items. Doing so would save the judges considerable time, both in reading and writing.
This could lead comments to seem terse to people outside the reviewing process. The only analogy that I can offer comes from the world of physicians (I work in a hospital). When doctors communicate about patients with one another, to someone outside the process their comments can come across as cold, harsh, or uncaring. In reality, the doctors are doing what they can to be efficient, and they often rely on somewhat terse communication.
Just a thought.