answer:I don’t know why they have moved that direction in English-type courses, but it’s not that way in every dicipline. Any work that is done in the sciences still follows the form you detailed for the scholarly discussion. For some reason, general writing courses, literature courses, and the like have moved to the “magazine” approach. I personally prefer the scholarly stuff, so it’s probably good I’m in the sciences. As for when, it’s been this way as long as I remember. They taught us to use snappy titles and hooks when I was in elementary school. The first year I remember being taught writing was third grade, so they made the shift sometime before ‘96.