If you can't write a good essay, you probably can't think and communicate in a logical and effective manner. If you can't think and communicate in a logical and effective manner, you shouldn't be able to earn any degree, because it's an extremely basic skill.
People who get any job that doesn't involve manual labor in the real world need to be able to, at a minimum, write a memo. People with higher level jobs, appropriate of a college graduate, typically need to be able to write reports and reason through decisions. Writing an essay and reasoning through a decision are very similar processes, when you actually think about it. You have to do research, you have to consider all the angles, and so on and so forth.
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