Burnout is a legitimate health issue for many people in this forum, and elsewhere.
Humans are inherently fragile beings with almost no redundant parts. If I fry your brain with long hours and politically hostile work environment and drive you to depression; vs. I fry your brain with long hours in physically exhausting environments. The results are the same - your brain is fried. One type of hostile work environment is not necessarily better or worse than another type of hostile work environment.
the same time, if you have a good support group and work hard strenuous hours (like rig workers) the physical isn't that bad because you have the bouyant comfort of comraderie. but if you are in an office stuck next to someone whose values you cannot stand and clash with yours, and whose boss demands and harasses you all the time but you are stuck working paycheck to paycheck because of medical bills or something.....that's a reason to want a factory job for some.
Having worked for a couple of years as a commercial electrician, I would choose that in a heartbeat over “knowledge work”… if they paid the same.
I suspect that there are many definitions of the term "burnout" being used by different people, making communication difficult.