Tiger Woods wouldn't win many tournaments if he used a 5 iron for every shot. Part of golf is knowing when to use which club. Likewise, effective teachers can select and use instructional strategies that move individual students closer to the goal--improved academic achievement.
It used to be that the biggest problems of recess were scraping your knee or having a run-in with the schoolyard bully. Nowadays the greatest risk may be to your school's Adequate Yearly Progress rating.