In fact a lot of financial stuff basically works on eventual consistency, they just don't call it that, wear suits and carry serious expressions. What is double-entry bookkeeping? What is an audit? What is end-of-day? What is end-of-financial-year? What is invoice due date? What is multi-currency accounting? What is a market order on an exchange before you learn what it was sold for? What is a credit card transaction that can be disputed? What is a tax return? ... etc.