Many schools have become extremely restrictive on how many essays they allow you to submit.
The crushing numbers of applicants has forced schools to streamline the evaluation process and they simply do not have the staff or time to read 1000 word essays from everyone. Of course, whether you're applying there or not, you likely know that Harvard, as an extreme example, actually has no required essays as part of their application! They allow you to submit one essay if you like, but it's not technically a requirement for consideration as an MBA applicant. While we don't recommend you submit to HBS without leveraging the essay, this approach from schools highlights the fact that every word does indeed count.