If you’re the picky type of writer who abhors deadlines, there’s a good chance you’re equally repulsed by re-writes. A lot of writers start off writing because it’s fun—once it becomes a duty, it loses its flavor.
Re-writing can taste just as stale, considering you’ve already brought to life the world and characters you intended. If writing is the creative, fun part then re-writing is the laborious, begrudging part.
By forcing you to constantly re-visit and re-write your screenplay, film school makes you put in the work you may not want to, but ultimately rejoice in. Suddenly that world you had so much fun sketching in broad strokes has become a fine-tuned masterpiece ready to be put on screen.