When you first learn about the basics of good writing, about how to best employ the senses, or how not to employ adverbs, there comes a moment when it all comes together, when it all makes perfect sense. Good sense that can’t be argued with. And you start employing those ideas in your own writing and no doubt your writing improves greatly.
However, it’s very easy to go from convert to zealot. The main difference being you suddenly feel the need to impress on others the true path. And in many cases others would certainly benefit from knowing the value of show versus tell, or that short sentences make action scenes more visceral. How could anyone disagree with using fewer clichés?
But that doesn’t mean it’s true for all cases.