I think about this advice all the time when I'm writing. I like to leave some things implied or revealed through subtle clues, little treasures for the observant reader to dig up. But I've had beta readers completely miss plot points because they weren't spelled out enough. Worst case scenario, this kind of impenetrability will get you some Amazon reviews like "couldn't follow confusing story, 1/10." There is an obligation on the author to make their work understandable, not just to someone who is combing through the book over and over with a magnifying glass, but to a typical reader as well. How do you all strike the balance between subtlety and clarity?