“Burned-out” is a linguistic reference to rockets.
Today burnout implies you have a weakness: a stressed gasket or aorta, an o-ring or an esophageal sphincter that can’t handle the pressure. Your psychological ‘deficiency’ manifests as physiological incapacity: you can no longer keep up.
More accurately, burnout is from overuse: a system burns you as an expenditure to test limits.
In this framing, you are a sacrifice on a pyre of productivity: a captive burned to appease monstrous gods.