I find pretty hard to have a clear view of the requirements through backlog user stories alone.
Our project is a complex web application for finance. The business logic is very complex, changeable and subject to endless business discussion: the final implementation appears to be the result of many stories spread over many sprints
As a small example, we have a field that calculates the interest rate:
- in the first story the formula is provided
- next commissions are added
- then limit and validation rules are needed