Ben Sims,
If I recall correctly, some time agoTom Doak posted that the high winds that blast Bandon was a reason that the greens weren't kept at high speeds. He may have commented on why there weren't wild contours/slopes on the greens and whether it was wind related, but, I can't recall.
With respect to triplexes, perhaps those who are younger and less experienced don't recall the problems triplexes caused with highly contoured greens when triplexes were first put into use, and, for years thereafter.
When one examines the 1st, 3rd, 6th, 11th, 12th and 15th green at NGLA under tournament conditions, it's clear that those highly contoured greens are compatible with high stimp speeds, provided hole locations aren't goofy.
However, the combination of highly contoured greens and high stimp speeds require more thought and strategizing, along with a deft touch.
Perhaps today's golfers find those tasks too overwhelming.