Figure I.1 is telling. It shows answer length is the strongest predictor of win rate. I suspect this is due to the flawed methodology of the study. Professors were instructed to be succinct ("Please be concise. We expect that each answer takes no more than 3 minutes to write down.") and likely erred on the short side. Also, professors may not have put great effort into their written answers, especially when already trying to be concise. This isn't the headline the authors think it is.