Writing non-fiction is a struggle between brevity and flow. You have these sets of facts you want to present, and you want to tell people how they're connected. It'll be so easy to just put them as bullet points and write the conclusion underneath. You get the facts, you get why they're being written down, easy. But writing demands so much more.
People don't want facts, they want stories. People don't want dry numbers, they want someone to tell them how the numbers combine. So you stitch those facts together to a narrative, to long strands of words, sentences, paragraphs. How do I put these facts together? Will people lost the connection (or, God forbid, the interest?) if I put them next to each other. Oh no no no, these two facts look unrelated. They are related, but they don't flow into each other when you're reading it.
And all of a sudden your writing is 80% fluff, with the facts only strewn over it. All of a sudden it'll take people ten times as much time to read through it. You realise with horror that you're wasting people's time. You're wasting people's attention. This is bad writing no matter how you put it.
You sigh for the hundredth time and start to rewrite the whole thing.
