Using big words and abstract phrases cuts into that group of readers who don't know what they mean. If you had to use a dictionary to read my stories, you might not be reading them very much, thereby missing out on all the great wisdom and household hints contained herein. My goal is to communicate information, opinions, ideas and other thoughts, and any word that hinders effective and complete communication by its unfamiliarity is contrary to my purpose. If a writer's readers can't understand what he writes, they won't be readers for very long, unless they are literary masochists or psychologists. I resist whatever urge I might get to become grandiloquently verbose.
Big words take up too much space in the brain.
I hope that makes you feel better. My brain hurts. I long ago stopped being awed by stars. For some, it's music, for others, sculpture or painting, or it could be a knack for mathematics or some branch of science or cooking, and the list goes on. But talent is far down the list from the really imporant things.