I dunno. You dig down and you get to Les Perelman's critique, mainly that the software will give an A to abject nonsense. You poke around on the web a little bit and you can find some of that nonsense:

I live in a luxury dorm. In reality, it costs no more than rat infested rooms at a Motel Six. The best minds of my generation were destroyed by madness, starving hysterical naked, and publishing obscene odes on the windows of the skull. Luxury dorms pay for themselves because they generate thousand and thousands of dollars of revenue. In the Middle Ages, the University of Paris grew because it provided comfortable accommodations for each of its students, large rooms with servants and legs of mutton. Although they are expensive, these rooms are necessary to learning. The second reason for the five-paragraph theme is that it makes you focus on a single topic. Some people start writing on the usual topic, like TV commercials, and they wind up all over the place, talking about where TV came from or capitalism or health foods or whatever. But with only five paragraphs and one topic you’re not tempted to get beyond your original idea, like commercials are a good source of information about products. You give your three examples, and zap! you’re done. This is another way the five-paragraph theme keeps you from thinking too much.

I can see the benefit of putting the software online and giving students a chance to "machine-optimize" it. But I tell you what - if I'm paying for school, and my future is dependent on my grade, that grade is going to be overseen by a human. I don't see that changing.