I see that this is a topic discussed long ago, but new for me, new subscriber to AoB, and new, enthusiastic, bonsai scholar.
I found your topic very interesting, besides the point of view of how an official judging of an exhibit works, from the view point of a starter: your article gives me what I would have liked to find, i.e. a subjective system for the evaluation of a bonsai, with explanations. Now I know where to start in my own examination, what to consider, and how to weight each of the most relevant characteristics. The first reaction is always instinctive, such as "I like" or "I do not like" (which will in any case be the first reaction in front of an artistic work, our internal driver), but an instrument for it's rationale rethinking is more than appropriate. It also means to have a learning instrument available, and the possibility to compare with other's judgment. The same as judging a picture, a photo, or a sport (as examples, ice-skating, or diving, where artistic and technical factors are taken into consideration for the final judgment and classification).