The curse of knowledge leads to bad writing

The better you know something, the less you remember about how hard it was to learn.

The curse of knowledge is the single best explanation I know of why good people write bad prose. It simply doesn’t occur to the writer that her readers don’t know what she knows—that they haven’t mastered the patois of her guild, can’t divine the missing steps that seem too obvious to mention, have no way to visualize a scene that to her is as clear as day.  And so she doesn’t bother to explain the jargon, or spell out the logic, or supply the necessary detail.

Steven Pinker, The Sense of Style: The Thinking Person's Guide to Writing in the 21st Century (New York: Viking, 2014), ch. 3 (footnotes omitted)