On the one hand, all the action, all the dialogue, all the grist that the mill of my method chews up, takes place in my mind. I can’t rent space in someone else’s head, and pull out their ideas, or run my concepts through their cognitive process to see which work and which don’t.
I sometimes can’t sleep because my head refuses to stop churning out dialogue and plot points. In an effort to not lose them, I sacrifice a little sleep and write freehand in a notebook I keep for their capture.
On the other hand, no writing takes place in a vacuum. As Sir Isaac Newton once said, “If I have seen farther than others, it’s because I stood on the shoulders of giants.” My giants tend to be shoddily constructed step-ladders that I’ve nailed together myself. But there’s plenty of time spent in research and development for characters, plots and descriptive text.
There are also the alpha/beta readers, who add their own influence. I even had a few friends who are fans, and ask, “So when is that next book going to be done?”