A backtest that looks clean on 5+ years of ASX or forex data tells you almost nothing about how a CFD strategy will perform going forward.
A polished backtest is not proof that your CFD strategy works. It is often proof that you found a set of rules capable of explaining one historical dataset. That distinction matters. Traders treat five or ten years of data as a badge of seriousness, then mistake a smooth equity curve for evidence of a durable…