Is walk-forward validation actually worth the effort for retail traders?

A simple dual Simple Moving Average (SMA) crossover strategy, tested via walk-forward validation on SPY, yielded a Sharpe ratio of 1.2 and a Sortino ratio of 1.84 with a maximum drawdown under 1%. These risk-adjusted metrics suggest the strategy outperformed a standard buy-and-hold approach for SPY over the tested period, implying that systematic, risk-managed entries and exits can generate alpha. The post implies a mildly bullish outlook on SPY when traded via a systematic, risk-managed approach, as the described strategy successfully generated positive, risk-adjusted returns. The focus is on the *method* rather than a strong directional conviction. The strategy is simplistic (dual SMA crossover) and may not perform well in all market regimes (e.g., choppy, sideways markets). The backtest period is short (one year), and the low trade count (7 trades) may not be statistically significant.