Journalism Reading

I found a big difference when comparing writing styles between the reading for today and the past two. The journalism piece was more to the point and it included clever little catch phrases like "supersize" to help reinforce its point. Also, it was much more cynical in context. Especially toward the end of the second page.
On a side note, I find it really interesting how the style becomes more relaxed as we go from the progression of technical writing, to academic writing, to journalistic writing this far. In a way it makes me wonder how these types of styles became labeled to the certain types of writing. Why can't the journalistic style be used for academic writing? Who decided what type goes to what? These are the questions I started to ask myself after reading these articles.