I agree with Doug Siebert that mathematical percentages fail here.
I tend to relate performance with those subjects I've followed carefully over the years.
In baseball, Bill James, the famous statistics guru, found that players tend to peak around age 27, the perfect combination of youthful vigor and mental experience. The same holds for basketball, golf, or other athletics. There's a peak period at a fairly young age. I miss that sweet spot when I was about 30-35, when I could still run, and "see" what was happening on the basketball court so well.
I know a fair amount about popular music, and often I feel an artist's first major album release is their best. By the time they enter a major studio the first time, they are fully formed, with their most creative songs. Chicago and Santana are two examples. It's rare for a group to push forward and be more creative and interesting from that point, like the Beatles. Also, in that type of music, there is often a sexual attraction element, where Elvis or the Beatles are just so darn cute when they're young.
Golf architecture doesn't seem to follow by the same rules. I conclude that experience trumps creativity, as very few great courses are the first effort by that architect, although a few exist, like Pine Valley and Oakmont.
Most importantly, it seems great courses happen when great time and effort are expended. I can't speak about how great course routing skills are acquired, but it must be experience, plus some innate visual skill to "see" the best solution. I imagine that skill diminishes with time, but only as the architect tires of the exercise.
So, after this long ramble, I think it's mostly hard work and attention to detail that results in great golf courses. In course routing, an innate skill at spatial orientation probably gives one architect an advantage over another.
One more example. Jazz, of course, is different than pop music. One of the most amazing things I've ever seen/heard was listening to Stephane Grappelli, the jazz violinist, when he in his 70s. All those songs and all that experience. He practiced and continued to tour, and when I saw him, he was so nimble and so full of musical ideas. Phenomenal.
Off to the golf course again. Back in a few hours.