About 450 years ago, Copernicus almost lost his head for suggesting that man and earth were not at the center of the universe. About 150 years ago, Darwin suggested humans evolved along with other living things. That idea is still bitterly opposed by some religions. About 100 years ago, Freud suggested that we humans aren't even in conscious control of ourselves, unconscious forces really determine what we do. Unconscious factors are still denied by many people.
Humans are prone to oppose anything that lessens their greatness, superiority, power, or importance.
Most of us don't like the idea that living optimally requires work. Look at it this way. If each one of us is attempting to mentally cope with some concern or task almost every moment of our life, in the course of a lifetime every person will deal with millions of unique situations and thousands of different kinds of problems. That's real life. Sometime during your life you will probably face almost every kind of human difficulty.