My dad the auto body repair mechanic may affect some aspects of my world view, but success in my career as a college president demands that I think and act as a college president no matter what my social or cultural roots may have been. The disciplines exist to create and maintain the collected wisdom of the culture and to apply that wisdom to problems that arise as a result of the interactions among human beings. Since most disease results from social contact, the entire medical establishment would be useless to you. Economic necessity would not exist bye bye banks, stock exchanges, business schools, legal departments, insurance and all the other baggage associated with money. Foot travel or swinging from tree to tree on vines would eliminate automobiles, gas stations, oil tankers crashing upon Oregon's beaches, air pollution and traffic cops.
Humans create the bases of knowledge and experience needed to solve their problems.
You acquire the knowledge and expertise and then offer your services to society. We are all here to serve the needs of others. The more in sync you are with the organized bodies of knowledge, the more you will prosper.