I think that's an overly uncharitable read on this approach. Lots of tasks that have difficult thoughts, that need to be thought before they can be completed, also have phases in which work just has to be done. I'm in the middle of collaborating on an article for submission to a physics journal. I wouldn't term it filler work, but most of the complex thoughts on the problem have been thought through and the work right now is creating a coherent story that goes over our results. An outline method would work fine for this part of the project.
As for the spy novel, i think the outlining is actually quite similar to how Sylvester Stallone described his writing process[0]. You wouldn't fill the outline with generic beats, you would put in your basic plan for the story.
As for the spy novel, i think the outlining is actually quite similar to how Sylvester Stallone described his writing process[0]. You wouldn't fill the outline with generic beats, you would put in your basic plan for the story.
[0] https://www.youtube.com/watch?v=v_xqfkVNwEU