This is my pet peeve on long-form writing. I'll get all excited about, eg, a 20-page article on a new discovery about black holes, but then bounce pretty quickly when the first 9 paragraphs are meaningless descriptive details about the reporter's first visit with the scientist who made the discovery. I realize the need to add human interest throughout a long read, but I get annoyed when it turns out it's just a 2-page article's worth of content spread out over 20 pages.