We evolved to take the path of least resistance. We categorize everything that surrounds us because it’s easier for our brains to process broad ideas rather than zoom into minutiae. Black and white both have clear definition. Gray areas are uncertain. Gray areas contain more questions than answers.
Maslow’s hierarchy of needs largely determine what we want to exert effort on. If foundational needs such as safety and stability are lacking, one will seek clear definition. If one’s cup is full in the areas of safety and stability, exploring the gray, great unknown is less likely to feel like a burden.