I look at that photo and wonder if the fw is/was flat because:
1) Seth Raynor is an engineer, and that is just what they do....
2) Seth Raynor as gca believed in proportionality, i.e., the harder the hazard, the easier the fw. Or, without much room to bail out left, he at least wanted nothing to do with a rolling fw kicking the ball towards the ravine. If it was Fazio, or most modern architects, he would have built a subtle ridge on the right side of the fw to keep tricklers in the fw.
3) Purely natural, although it seems clear the bank to the ravine was at least smoothed out to plant grass, if not intially, then at some point.
Short version, if you need to critique the flat fw to claim this isn't a great hole, I think you have too much time on your hands, LOL>