Basics of task management

A manager needs to be a successful leader, but this is impossible without knowledge of psychology. The patterns of human behavior are studied by psychologists, psychiatrists, anthropologists, sociologists, political scientists, philosophers and representatives of a number of other sciences. However, the results obtained are difficult to compare, since each science has its own view of human nature, its own methodology, and a special conceptual apparatus. And instead of a holistic view, our knowledge of human behavior appears in the form of a large number of observations, abstract theoretical descriptions. All this is transferred to management theory. In particular, business communication, conflicts in an organization, teamwork methods, competition and cooperation processes are studied in isolation from the deep systemic patterns of human behavior. Why, in your opinion, is knowledge of human behavior not only inconsistent with each other, but often turns out to be either trivial or simply unsuitable for practical use in specific management situations?