I contributed to this collaborative article on LinkedIn on Product roadmapping and Revenue.

Here is my answer to "Why is forecasting revenue important?"

Having in mind how much commercial growth (new business and upsell) will help you realise whether your roadmap is only filled with minor enhancements which won't make a difference, or if on the contrary, your roadmap has the potential to deliver substantial value.

While sales team can achieve their quotas with the product "as is" in the current quarter and the next one, after a 6 to 9 month horizon (depending on your average lead time), the product and technology teams are accountable to enhance the product value, so that the company can meet its commercial targets.

It's critical to confirm that what you're intending to build has the potential to sustain commercial growth.

Back of the envelope estimates are often enough to uncover issues or confirm you're on the right track.