Many teams and organizations plan for anywhere from a quarter to years before the teams can deliver anything. That planning creates the illusion that the organization knows what the products will be and the value those products will deliver for the organization. The problem is that the more valuable (and often riskier) the product, the more we need resilience and feedback in product planning. Instead of big planning, especially up front, consider using smaller and continual planning that incorporates feedback.
Agile approaches allow us to complete small features, assess them and our process, and take the next feature off the backlog. What if we were able to generate the big-picture vision for the product, and yet be able to change what the teams work on next? We would have the best possible approach to product planning and delivery. That’s why using agile and lean roadmapping works so well for products that take three months or more to deliver.