Where I find Moneyball (and a lot of A/B testing) falls down is in the complexity around the player (or mechanism). Teams often contain players whose value is

Where I find Moneyball (and a lot of A/B testing) falls down is in the complexity around the player (or mechanism). Teams often contain players whose value is off-pitch or subtle: leaders, morale-boosters, supporters. The system that Moneyball demonstrates would struggle to find the a manager that would uses a Moneyball-type system. Where are the stats for the team-picker? While I'm definitely not saying that there is magic in sports (nor any successful website that ignores A/B testing) I am saying that sometimes a talented spotter (or a talented designer) can produce a fit that a spreadsheet cannot. (yet.)