On the other hand, a really specific (short) word limit can force one to be more creative and improve the text. I love the Blaise Pascal quote: “Je n’ai fait celle-ci plus longue que parce que je n’ai pas eu le loisir de la faire plus courte.”
In English: “This letter is very long because I did not have time to make it short.”
In other words, brevity is not only the soul of wit, it takes more time to achieve, sometimes, than much longer pieces of writing.
This post notwithstanding.