JWL,
I think there's a degree of difficulty component that was/is included in the rating procees.
I believe they refered to it as the "resistance to scoring" category.
That would clearly indicate that difficult does factor into the rankings.
In addition, to some, if not many raters, difficulty or resistance to scoring doesn't go unnoticed or unrecorded.
As to Sand Hills, from the douible diamonds, with typical winds, I don't know of anyone other than yourself who has declare that it's not a difficult golf course.
Tommy Williamson,
It's difficult to create movement in the "Classic" category since no new courses can be added, hence preservation of the status quo seems inherent in the rating process.
What rater, already knowing where Cypress Point stands in the ratings, would dare give it a low score. To a degree, raters are influenced by those who have trod the fairways before them. Most are keenly aware of the ranking of the course they're about to play.
To a degree, "Classic" courses are given a pass in the length department.
With respect to modern courses, unless wind or unique features are present, length appears to be a critical factor.