The predictive power of this method largely depends on the quality of the historical data (and here we have one of the best sources - EODHD!), the robustness of the chosen machine learning models, and the specific strategy being employed. While it can provide valuable insights and improve decision-making, it's important to remember that no model can guarantee success due to the inherent unpredictability of financial markets. Continuous evaluation and fine-tuning of the models are essential to adapt to changing market conditions.