If somebody isn’t adept at making a plate of pasta, giving them truffles, cold-pressed olive oil and parmesan cheese will not turn their dish into a masterpiece. In fact, it is easier to learn to cook with a handful of simple ingredients.
Merely adding erudite words to a writer’s prose wont elevate its quality. Rare, scholarly words are difficult to use – they aren’t easily translatable and fit only in much narrower contexts than their more commonplace synonyms.
Simplicity is an aspiring writer’s best friend. Like exotic culinary ingredients, every complex word is expensive and takes some practice before it can be integrated into one’s vocabulary.