The weak link is the extrapolation of performance from a technical test bench to market reality, where data interpretation is taken as concrete proof of resilience. A quantum system can optimize 250 assets in the laboratory, but it will collapse in the face of an unforeseen liquidity shock. The blast radius of such an event, like the Swiss franc disconnecting from the euro, is much more devastating than any algorithmic optimization. Performance in a controlled environment is one thing; navigating real turbulence is another.