Kirk,
Hope this is helpful;
THE NEW OR WEST COURSE
This course, as has already been said, presents many features that differ from the old or east course. Where in the former the greens are large and slightly rolling, in the new the greens are much smaller and very markedly rolling, with hillocks, and in some cases deep hollows in them. They are in wonderful condition, though, as already stated, not as large as those found at the east course. This was done for the purpose of making a variation in the two courses and for the further purpose of assuring accurate iron shots and a greater variety of playing to those using both courses.
The beauties of the new course have to be seen to be appreciated, for even the best of photographs cannot do justice to some of the wonderful views that stretch themselves before the golfer on hole after hole. - Robert Lesley 1914
………..The West course was designed particularly for the benefit of “the ninety and nine” and for low cost of maintenance, in both of which respects it was most successful. Very little bunkering was done but the ground was rich in natural contours and hazards and they were utilized in an extremely clever way. While not as severe as the East, it is a real test for even the best of players as was shown in the qualifying round of the National championship in 1916.
It is so lovely to look at that it is a pleasure to play and I like to remember the comment of Mr. C.H. Alison of the celebrated firm of Colt, Mackenzie and Alison—British Golf Architects---who, after going over both courses said: “Of course, I know the East is your championship course; yet while it may be heresy for me to say so, I like this one even better because it is so beautiful, so natural and has such great possibilities. I think it could be made the better of the two.” - Alan Wilson 1926
As far as Cobb's Creek, I'd have to go through about 200 articles to find proper verbiage, but it was built for two reasons;
1) To provide a difficult challenge to good players, so that they could improve their games, making Philly a more competitive city in golfing competitions (similar to Pine Valley in that regard)
2) To provide a test that even beginners could get around.
In case anyone is doubtful that if it met those twin goals, I'd point you to about another 100 articles that clearly prove that it did in spades.