Best Practices are based on past experience, a best practice to a problem that we already solved. Necessary but not sufficient.
Past experience may be helpful, but seldom covers all the bases. Past experience seldom anticipates change and often misses critical elements that will be different in the future.
Best Practices are what we teach in school. Those who live by Best Practices will find themselves perfectly equipped to deal with a world that no longer exists. Accomplishment always happens in the future.