Lamott is arguing that everyone's first draft will terrible, even among the best writers.  She states that few writers know what they are doing until they finish their first drafts.  She believes that "The first draft is the child's draft." (2).  This means you put down whatever you want.  You can always change it later but you may come up with something unexpected or interesting that you decide to keep in the final draft.  She is trying to tell us that writing is not something that you will get right the first time, it take a few tries to get the perfect words down on paper.  This is applicable to or Wikipedia project because we will have to make many revisions and we will have their editors checking over our work until it meets their standards. This aspect of the Wikipedia project, in my mind, supports Lamott's thesis