By now, no doubt, it must be among my most wearily familiar complaints. Only last week, in fact, I was again lamenting the days when old-school trainers would start Classic campaigns round one turn, gaining sharpness and conditioning without entering a stress zone. Nowadays those benefits are forfeited by the twin imperatives of hiding horses in their stalls, even as they need GI Kentucky Derby points. Those points being unavailable in sprints, the defining test of the American Thoroughbred has duly been shorn of raw speed. Other traditionalists presumably shared...