“The point is, your style guide-or any given "rule" you learned in school-was created so you would do something the same way every time for the sake of consistency, for the reader's sake. It's less distracting that way. You learn style rules so you don't have to stop and ponder every time you, say, come to a number in the text: "Hmm. Here's a number. Shall I spell it out? Use numerals?" You know your chosen style by heart, so you just flybywith confidence. Style rules aren't used because they're "correct." They're used for your convenience in serving the reader.”