:  Well, I'm not sure.  And I'm not sure its worth figuring out, because I am not convinced that all edit summaries have to "help."  If that were the case, it "helped" in at least a couple senses:  (1) it expressed my strong disagreement with the edit I had undone, you had re-done, and then I had re-un-done; (2) it served as an indication that, following your edit summary, I read the article to which you directed me and found that it did not support the assertion; (3) it generally lets people know that I am not a nice guy.