I’m a quant. If all you care about is the realized return of a equal-weighted portfolio than sure, just look at mean return. If you’re trying to understand a strategy in depth you’ll want to look at the entire distribution of hypothetical returns, precisely because financial returns are fat-tailed and portfolio returns are often driven by outliers. I don’t know about SPACs, but for common stock often the outlier returns are in small illiquid stocks where you couldn’t take a large position.