When you open an email and see a big chunk of text, are you excited to dig right in and read it? Probably not. (Yet, do you ever find yourself sending those types of emails? Probably.) The reason why you lack excitement in reading such an email is obvious. Large chunks of text generally don't get the extra thought required to pare them down and helpfully section them off with subheads. Such content is basically a first draft, with possibly a once-over edit pass. It takes less time to construct.