There’s a romanticized version of an author created for visual medium (film and television primarily). An author types up a page and it looks great for the camera. You watch the blank page fill with perfect (or near-perfect) type. There’s movement of paper and carriage. There’s sound of keys tapping, sometimes even clunking. You, the audience, have experienced a satisfying audio-visual representation of progress.
In real life, progress is rarely a smooth transition creating something from nothing. A musician practices until the sound is consistently controlled and can express what was intended.
Writing fiction is a tangle of trying things, learning from the failure then trying other things; piecing together ideas until it expresses the story you intend. Scrutinizing details can make you tired of the whole project. That’s usually when you need a focal reset. Unclench your jaw, creative one.
But cinema doesn’t find the jarring notes or the off-key sounds of creative failure “pretty”. It’s not entertaining to plod along in real-time.
That’s the magic of editing.