Ideas are easy to conceive, as individuals or an organization. These ideas birth different projects within the context of an organization or a nation. The human mind can be unlimited when you have brilliant people, swimming in an ocean of ideas of how to move the company forward.
They may even have the big picture figured out, which is very good. Stepping into the project management space where you have to transform these ideas into reality, a proper scope of work needs to be outlined.
Having a scope defined, sets boundaries around what will be done, and what will not be done to create value and achieve the objectives of the project.