Tim,
One would have to ask, was C.B. Macdonald being lazy when he crafted and copied the great holes he admired ? 
I think it goes back to inherent enduring values.
Some holes are so architecturally worthy that they demand replication.
My neck of the woods has an abundant number of CBM/SR/CB courses and I've never tired of playing them over the 60 years I've been playing them. They are just as enjoyable today as they were 60 years ago.
So, why would I object to their existence ?
Patrick-You are preaching to the choir. I agree completely and am always thrilled to see a new one. They have stood the test of time.