To be fair, even if I have to look up half the words in the post to understand what he's trying to say, 'Do not use a thesaurus' still has weight - it's one thing to already know the perfect word for what you're trying to say (even if many others don't know that word), but another to decide on a whim that a given word should be replaced with a more 'advanced' alternative without knowing what you'll find or understanding the nuances of your pick.