Companies find it very tough to survive in current fast changing markets. You can not sit on a one year plan assuming that it will strike gold! You need to monitor your strategy implementation, measure it and make necessary changes. Some leaders who are extreme agile(giving complete autonomy) get this wrong and they pay the penalty of being extreme agile. So it is a balanced approach that you need to take depending upon the culture and maturity of the hands at work.
You can read my earliest post “Do You Think Your Strategy Would Succeed?“