Decision fatigue is a real biological phenomenon. The more decisions you make during the day, the more tired your brain gets and eventually the worse decisions you make.

So when you see that people like Steve Jobs or Mark Zuckerberg wore the same outfit every day to eliminate deciding what to wear. It’s a justification actually backed by science.

However we don’t understand exactly how decision fatigue works.

https://www.economist.com/science-and-technology/2022/08/11/how-thinking-hard-makes-the-brain-tired