The problem I see is that the delivery system has evolved in many companies / tech in general to be JIT, but for human resources.
While at FAANG, I was at capacity every week. So a 'normal' week (which was actually quite rare), I expected to spend 35-45 hours in work + meetings.
But 75% of those weeks, some urgent issue would come up. Then you have an extra 15-25 hours of attending to the urgency, falling behind 5-15 hours on planned work, and then you spend all evening thinking about how to solve the Very Urgent Problem.
Even if you are good at compartmentalizing, you'll be confounded by redundant messages from middle managers asking you about the status of the Very Urgent Problem.
Taking a break / vacation means twice as much work for 1-3 weeks before the vacation, and 1-3 weeks after, as you must prepare for coverage for while you are out of office, and then catch up on what happened while you were gone.
Add in the death of a loved one, medical issue or even a string of minor problems and you're completely subjugate to external circumstances. This will lead to burnout, at a minimum.
As a younger person, this kind of environment made me feel important and necessary. Later I began to realize this is the opposite of the truth. Important and necessary people have the power to set their own terms.
I am not sure why things have evolved this way. I recently watched Koyaanisqatsi ('life out of balance') a film from the 80s about modernity and technology and found it as relevant as ever. However the busyness that used to be outwardly visible has now migrated into our minds and seems to be causing mass unhappiness and mental health issues.