there are certainly some subset of customers who can write effective product requirements for any product, but certainly not all or perhaps even most. the poin

there are certainly some subset of customers who can write effective product requirements for any product, but certainly not all or perhaps even most. the point of users stories is not to lose sight of the origins of a domain traversal problem (from customer/problem domain to product/solution domain). jumping straight to writing tasks assumes high intimacy with the problem domain and the solution domain, which few people possess. the best product managers have both of those, and still are humble enough to regularly test their assumptions by writing user stories first backed up by quantifiable customer experience.