This is an offshoot of the Kingsley Club thread, in which Nick Christopher posted that he thought Kingsley "went to the precipice" of being too severe, but did not cross that line. What I want to discuss is the subject of whether there IS such a line that can be crossed, or whether there is no such thing ... and whether golf course architecture has to push that line (and how far) in order to be really good.
First of all, if there is such a line, it will vary depending on the observer. And there may be some observers for whom there is NO line, but I suspect that is not the case; I am sure I could build something they thought was beyond the pale, if I really tried.
Second, if the line is variable, I think it must also vary depending on the elements. On a really windy day even a plain-Jane course becomes very difficult in places ... so a course on the precipice would likely be blown over the edge.
When I was building my first course at High Pointe 22 years ago, with my friend Tom Mead [who Mike D. also knows well], we both agreed that we were not going to aim for the course to be loved by everyone, as so many courses try to do nowadays. Tom's opinion was that we would strike the right balance if 50% of golfers loved the course, and 50% hated it. That would be really pushing the envelope.
Of course, most clients would disagree with that perspective [even though we did not really make High Pointe THAT severe]. Our client Mr. Hayden was not part of those late-night discussions, but as soon as the course opened and people started complaining about any little feature, he started doubting if we'd really done the right thing. They never took care of the course as well as they should because they didn't understand it very well, or the philosophy behind it; and now the place is closed, so its ability to generate thought and controversy is sorely handicapped. So, that reality prevents most architects from taking as much of a chance with bold design as they might if they were George Crump and it was all their own money.
After twenty years of practice, my own thought is that there is not really a "precipice" as Nick suggested [or as Mike Hurdzan suggested in his book]. A golf course is a combination of small elements, and if you put too many heavy ones on the scale, you are in danger of tipping it over. But since the tipping point is never clear-cut, I tend to stay back a bit further from the precipice than some others today, because I always have the really windy day in the back of my mind. And I've learned that you can have a really fun course that gets a great view of the abyss without taking the chance of falling into it.
I firmly believe that some of those elements should call for extreme skill ... say, the second green at Kingsley, where nothing but a straight shot will do. But if you do that too often, most people won't enjoy the course ... so some of the other holes should require a shot which has to be played hoping for a certain amount of luck on the bounce. And by no means should this discussion revolve just around Kingsley. It's applicable to lots and lots of modern courses -- including every single course by Mike Strantz or Jim Engh, and probably half of mine or Bill Coore's or lots of others trying to make a name for themselves in the past 20 years.
I have never really tried to put this idea in print before so I should probably stop here and let others discuss a bit, while I refine my thoughts.