My interpretation was that sometimes, leaving tasks to balloon from 'C' to 'A' priority comes with a massive increase in cost. In that case it's better to sched

My interpretation was that sometimes, leaving tasks to balloon from 'C' to 'A' priority comes with a massive increase in cost. In that case it's better to schedule time to deal with the 'C' task earlier. This is nothing new, of course, and, like any other advice, has to be applied in context.