I read the list of burnout symptoms and that makes me think: maybe this problem could also be considered from the perspective of Reinforcement Learning, as it is applied in AI. In RL, there has to be a balance between exploration and exploitation. Burnout seems to be a condition where exploitation is prioritized too much over exploration.

It is true that in exploration there is no guarantee that a better reward will be found, but unless we explore, it's much harder to get to learn anything new and cut our future options. Our sorely missing downtime is exploration time, random choice time, free of expectations, liberated from the need to always make the greedy choice. We need more of that in order to explore the space of possibilities that exist beyond our experience. When we cut ourselves from randomness we box ourselves into the small space of known strategies, and burnout is just a negative reward signal to let us know we are being suboptimal even as we strive so much to excel.