This specialized event was developed based on what people wanted to see and hear. To make the event faster than pylon racing, something different had to be allowed, so diving is part of the game. The pilot needs to set up a perfect slope from an entry height of 50 feet and maintain a gradual slope to [15?] feet at the end of 200 meters. To get the maximum unloading but also enough thrust to maintain speed through the course, the event becomes a quest to find [make] the magic prop after all the other hoops have been jumped through.
One advantage of the stretched out conventional designs that I see is being able to thread the needle through the timing zone with less input. Deltas are amazingly smooth and precise,[in spite of themselves] but it's a matter of degree that I'm talking about here.