Comment by abeppu

I've never seen a roadmap planning process that didn't involve some component of asking departments and teams what needs to be done.

To the extent you have successful products, it's because you have product managers and engineers and data scientists and depending on the product, integration/forward deployed staff. These should be the people with a view to how the product needs to meet the needs of future customers, the challenges faced by existing customers, and the technical components needed to get there. I'm not saying you encourage them to just spitball ideas from ignorance, I'm saying you solicit their expertise on the limits and needs of your products, systems, tools, processes, messaging etc.