DMoriarty,
If you look at the redans at NGLA, Shinnecock, Piping Rock, The Knoll, Yale and others, while they are variations of a theme, they are basically templates that succeed quite well, and most of them are totally artificial or constructed as opposed to just being there, in the land.
The Biarritz at Yale, Piping Rock, The Knoll and others aren't naturally found as much as they are constructed.
The same with Eden holes At Yale, The Knoll, GCGC, etc.,etc..
All of these holes have stood the test of time and remain exceptional golf holes enjoyed by most golfers.
Why wouldn't you want to incorporate them in a design.
I don't think that anyone standing on the 18th tee at GCGC or the 15th tee at Yale or the 13th tee at NGLA says,
"what an inferior hole, and, I've seen it before"
Approaching the 8th green at Piping Rock or the 7th Green at NGLA isn't boring or unchallenging, in fact, it's rather exciting, despite having seen and played the original road hole.
Like rare gems, certain golf holes are enduring and precious.
Tom Doak,
I thought # 17 at Pacific Dunes was a fabulous hole on a grand scale. Big, bold and challenging.
In no way was my feeling about the hole diminished because I had seen variations of the hole previously.
Sometimes originality can be forced when a template might be the perfect solution.