In a state of severe motivational crisis (true burnout, not the yuppie-flu decline-of-interest that is often given this name), people aren't thinking clearly and are not equipped to do that. At that point, you're in survival mode and you're barely passing at that. Fencing with existential dragons is not going to help.

People burn out for a variety of reasons but--again, if we're talking about true burnout--the cause is usually not just stress but distress: a subtype of stress that is relentless, purposeless, acutely dysphoric, and often imposed by external forces. The problem is that sometimes those external forces are wholly imagined (delusions and hypervigilance brought on by nervous exhaustion) and sometimes they are real and malevolent (such as in the case of the need to work to survive, which is imposed on us by an upper class we lack the organizational capability to remove from power and eliminate) and the burning-out person is never well-equipped to sort out which is the case.