The point is, production is the mother of fluency and voice. The less students are encouraged to record their thoughts quickly and passionately, the less likely that writing will ever become second nature. The story is told of a mountain hillbilly who for the first time in his life discovered a mirror in the trash pile of a burnt-out cabin. He took the mirror home that evening and gingerly placed it under his mattress. Like the mirror, words reflect thoughts to the writer, allowing the author of those words to reflect and cogitate.
Conventions are to be stressed in the final stages of completion.
Pressure to get it right as the student gets it out creates a focus and fear that disables the student. Michelle's focus is on the hood, so the Buick lurches left and right as she pursues the elusive goal of keeping the car in her lane. If she progresses as the others have, she will learn to look further ahead, and the placement of the car will become automatic. The details will be subsumed by a view of the destination. In spite of my best efforts in writing workshop, Phil would not write.