Also be extremely skeptical of people who lump together lawyers, financiers, doctors, and executives; they are all very different types of jobs with very different pay structures and hourly/daily/weekly schedules. It's just as inane as lumping in restaurant servers with longshoremen.
And be even more extremely of people who lump in upper-middle-class white-collar wage earners with the "super rich". It's just as inane as lumping in people living on welfare checks and people who work a blue collar job on a union salary.
Given the cost of living nowadays in major US metro areas where those professions are concentrated, only a rarefied tiny fraction of people in those professions can make enough money to be richer than "comfortably upper-middle-class" anyway. Things of course are different in areas where houses cost $300k and not $1.3m, but they make comparatively less in those areas anyway.
Finally, lawyers, doctors, and (some) financiers do absolutely work 50-80+ hour weeks. Maybe not every week, but certainly more than a few weeks out of the year. And rarely do they have a "down" week. And not all of those hours are "billable". These people are paid not just for their expertise but their ability to grind through hours and hours of tedious and tiring knowledge work.
Perhaps they are overpaid in relation to people who work with their hands, but that is a completely separate discussion.
The point is that it's insulting and fallacious to claim that people in these careers do not work long hours, and therefore it's insulting and fallacious to conclude that susceptibility to burnout in these careers is exaggerated.