Rich:
I have to argue the point that Pacific Dunes is no more 'natural' than Shadow Creek. On the one, if you hit your ball off the grassed area into sand or native rough or gorse, you're often on a part of the course that was untouched by construction. On the grass, though it has been cleared and irrigated and seeded, perhaps 90% of the surface area of the course is still at original grade. That is a fairly good contrast with Shadow Creek, where every single square inch of the property was regraded and relandscaped.
John:
I guess if anyone really believes a course is "perfect" when it opens, then the only way it can evolve is downhill. Sometimes, though, I'll leave a tree hoping that it will grow more into play in ten years, or a rough-and-tumble sandy area expecting that it will evolve differently over time, and trust mother Nature to take care of it for me.
In the case of Pacific Dunes, I also trust Jeff Sutherland and Ken Nice to preserve the challenge of the course instead of making it easier for their crew to mow ... but we're all fortunate that the course generates the revenues to make that possible.