Irony in Style Manuals

The  irony I previously noted is not confined to writing statements of faculties at small liberal arts colleges.  It is also found in professionally published style manuals.  On the one hand, I suppose this should be expected more often in a large document that is undoubtedly produced by many separate groups working in tandem, but on the other hand, this is their primary task, and they do not have to worry about classes, research, student questions, grading, and the endless meetings of a professor's life.