Matt,
For me, an ideal routing provides for a wide range of shots with minimal repetition over 18 holes. In areas where there is a predominant wind for much of the year, frequent changes in direction makes the task of mixing shot requirements much easier.
In addition to the logistical aspects of the routing, the sequencing and flow of the holes are very important. While two loops of holes with par of 4-5-4-3-4-5-4-3-4 may lend considerable variety to a course, site characteristics seldom if ever allow for it.
An exception might be a large, rectangular flat site like Tom Doak had at Texas Tech. There he had the budget and mandate to create a substantive course. There were few if any natural features to incorporate into the design.
While I too think very highly of the Rawls course, I found the two par fives finish to be unusual. Even though they go in different directions, for most of us they require a driver, a metalwood or long iron lay-up, and a short iron approach.
I can understand having two par threes in a row like CPC's 15 and 16 to take advantage of the incomparable coastal green sites. Even though the orientation is similar, 15 is generally a delicate, feel shot, while 16 requires a masculine, solidly hit straight ball.
In the former (Rawls), the architect made a decision to place similar holes back-to-back not because of site limitations. As we know, MacKenzie had some qualms about #16 but the physical characteristics of the site more than justified the final decision. (I find the back-to-back par fives 5 and 6 less justifiable, though they are fine by me.)
BTW, changing directions repeatedly does not ensure variety. I've played at a course where longer par-fours generally playing downwind are followed by shorter par-fours going the opposite way. Unless the wind is really howling, the result is often drives and approaches with the same clubs and similar shaped shots.
BTW2, which 16-17-18 finish do you like better, the multi-directional one at Rawls or the one at Sand Hills which goes primarily one way? Which is more repetitive and allows the better player to hone-in his game?
I do look forward to seeing the two new NYC area courses if only from afar. There must be some major $$$$$ out there to justify such hyper-expensive construction.