It's the timeless notion of "work". All the chaotic constraints thrown at one person: teammates, customers, tooling, psychology, politics.. they will turn anything into a slow boiling hell.
That said some domains are cleaner than others, just like small rivers have clearer water, I remember working in food stores or even mechanics and you don't get the same kind of fatigue as in software engineering. The stimulations are more diverse, a bit deeper (helps getting into flow in a way) and the culture helps (less discussion about shallow things like indentation). Fast food for instance, being a real-time thing requires tight planning and tight execution, no space for slack. It makes you sweat but you get seriously fast and good at your operations. Unlike coding where you can spin in circles for ages never get anywhere, and go home drained feeling useless.
That said some domains are cleaner than others, just like small rivers have clearer water, I remember working in food stores or even mechanics and you don't get the same kind of fatigue as in software engineering. The stimulations are more diverse, a bit deeper (helps getting into flow in a way) and the culture helps (less discussion about shallow things like indentation). Fast food for instance, being a real-time thing requires tight planning and tight execution, no space for slack. It makes you sweat but you get seriously fast and good at your operations. Unlike coding where you can spin in circles for ages never get anywhere, and go home drained feeling useless.