I think most subjects come in cycles. I think artillery can become an attractive subject because the subject-matter contains a lot of quantitative data to be evaluated, developed, and debated. In my opinion, however, I think that so much quantitative information can distract from evaluation of the intellectual or conceptual side of the subject, the aspects less amenable to quantification . . . like handling, battle-management, usage, tactics, and so forth (some of which might be included under the heading of "doctrine", if contemporaries had used the term). And I think that we are also frequently slow to extend what is established about the quantifiable elements into sorting out what that data means in terms of the equipment's actual use and performance in the field.