> But, most writing has purpose.

Over the years, I've become an odd fan of documents that start with a "purpose of this document" section.

Sure, it seems weirdly bureaucratic at first, but as time goes on, you start seeing documents that don't really know what their focus is anymore, because different authors decided it was the least-bad place to dump their own guide, checklist, or opinions.

L for example, imagine four documents about an API: A how-to guide; fine implementation details; a diagnostic checklist; a primer for executives or salespeople considering it as a product.