This is conventional thinking. It's a self-reinforcing lesson that life is about accepting unattractive and unpleasant trade-offs.
e.g., Either you are an artist and know little about business or you are an economist and have no understanding of creativity, art, culture and growth.
Door B: "Or" accept the world as it is
This is conventional thinking. It's seeing all aspects of life as an "either/or" exchange. Life is full of dichotomies, and you just need to pick the lesser of two evils.