The writing process comes in many stages.
Some may wait to finish one project before working on another. Others can work on multiple projects at once because they are in different stages.
It is at the artist’s discretion which procedure to follow. The road map is really just suggestions, after all.
One of the tasks of the artist is to find which method works best.
Suggestions can serve as clues, but those clues must be interpreted and practiced.
Only then will one understand their own “process.”