This is because there is middling stuff and grammatical stuff. Some writers I know can look chapter-by-chapter at a story and give structure, setting, and character with a closer examination than I would expect from my alpha readers.
But the very last things I want to address is grammar, punctuation, word choice, sentence structure/ sentence clarity.
This because I want to focus on the story first. I need the fixing of the tiny details to be the sign to myself that the work is done. My temptation would be to meddle with my own story for the rest of my life--but that serves no good. It is important for me to tell myself “no more” and the pickiest details are the best way to do this.
To complete making grammatical alterations to a manuscript, I don’t have to wrestle with any big concepts. I go through the problem places systematically and I won’t need to reread my story. If I reread, I change. That’s just what I do. Nothing is ever done.
So the final changes need to be the brainless ones, and then, I go to the next step.
My grammarian writer friends will see the WIP here because their plentiful feedback will be just what I need. I won't have to give them a checklist, just a note and they'll know how to take it from there. Likely this will be very important because I'll be shifting to a new project at this point, partially to keep up momentum and partially to distance myself from the WIP currently changing hands.