Here's why:
* Drafting: The focus is on getting your ideas down. You shouldn't be overly concerned with typos at this stage.
* Revising: You're checking for clarity, organization, and content. Typos can be distracting, but they are not the primary concern.
* Editing: This is the time for meticulous attention to detail, including grammar, punctuation, spelling, and of course, typos.
* Proofreading: The final step where you catch any remaining errors, including typos.
While you might catch some typos during drafting and revising, the main focus of editing is to ensure your writing is free of errors, making it easier for your audience to understand and enjoy your work.