If you need to get going quickly to ride the wave of a fad before it fizzles, then fast, bare_bones planning may be all you've got time to execute. This works best when you've already got the infrastructure in place, perhaps from previous projects or an established business, and you can simply shift energy and resources to the new idea.
Why is that? The intent was there; the energy was present; and ideas were flowing. That's the easy part _ coming up with the ideas. The success of your planning doesn't rest on the ideas, but rather, implementing those ideas. It's true, companies need to foster innovation in their business planning, but more importantly, they need to create a business environment that enables team members to execute these ideas with an "on_time, on_budget" mindset. That is where the work begins.