No good writing is ever designed past a point. Novelists, essayists, journalists, all have a distinct style. Most of them break all the rules there are. Online, there's an even huger difference, even in similar fields. Jason Kottke versus Andy Baio. FiveThirtyEight versus Andrew Sullivan. Nobody sounds the same. That's the point.
Do you want Copyblogger? "Make bullet points, bold words to emphasize, write short paragraphs, include five links in every sentence, include a picture of a naked woman with lolspeak written above?" Because all you'll learn is that there's no such thing as a "salient feature" of writing. There's writing, and different people do different things, and some people like certain kinds of writing more than other. Some people write paragraphs with a few hundred sentences, and people read their stuff because it's good. Other people write in very sparse shorthand. It's all allowed, and it's often all good.