Sometimes the theories and views of economists do not match what is happening in the field. They are drafters, not implementers.
Those who can change the economy are those who are directly involved in the economy who do not only rely on theory but they also rely on the experience they have gained in dealing with economic problems. Those who have been involved in economics for a long time and have sufficient experience tend to work tactically and sometimes don't care about theory.
Theory is often at odds with practice, it's true. But without theory, it is difficult to achieve much ecocnomic success. Understanding of economic cycles and interrelationships helps to conduct more complete analysis and make more accurate forecasts of the development of the situation