Imagine you truly were an outlier. One of those 10x guys. If you were that good, why would you choose to work more hours? So you could get 15 times as much done in that one day instead of just 10?
Put the way you did, the natural conclusion to draw would be that outliers would be the guys getting their thing done in fewer hours, while the average guys trying to fake it would need to stay late.
Because you have a high drive and are intrinsically motivated. Because you find your job satisfying, want to get rich, famous or make a life saving discovery etc.
In my opinion burnout comes from working long hours in a job you don't really care about. There are plenty of people who don't burn out from working hard, they just have really unbalanced lives.
Because you have a neuro-atypicality that means you prefer to stick with one thing for many hours.
Neuro-atypicality that means you prefer to stick with one thing for many hours usually have you preferring routine and well organized predictable structure.