If I were doing this as a high schooler (I'm not denying I might've for some assignments) I'd do it a couple sentences at a time, like, give it a topic sentence and kind of fill in the blanks for the rest of the paragraph. Especially if it were common core garbage. Sort of like using it as like autocomplete or something.

That would save me time & make it easier to start and focus on assignments, but still end up outputting a very reasonable essay