The idea was to get people to include more substance. Instead of just saying "Washington crossed the Delaware" to get students to include reasons why, impacts, further narrative, etc. IDK if it was effective or not. Probably at least a little; there's only so many ways to rewrite the same thing over and over. I know in my case though I submitted essays below the word count a few times, but since I actually included the content they were looking for I didn't have any problems