While I agree with you that as you approach perfection each incremental stroke is more difficult, I think perfection is closer to -15 or -16 for that course. For a long hitter, a good day on those four par 5s is probably -6 or -7. After that, you only need 3 or 4 more to get to -10, and for four of the short par 4s a long hitter can easily be within 30 yards of the hole after the tee shot. The even par average is very misleading as it is the whole field and it requires a bag that is used for the other holes and those courses. Just preparing for Ben's course requires fewer clubs and changes to the bag. For example, a pro may go 48 52 60, but if he were to play Ben's course, he may go 48, 52, 56, 60, 64 and drop other clubs he won't use. A 200 yard shot for me is a four-iron that goes 192 in the air and then rolls to 200. For the long hitters, it's a seven-iron that goes 200 in the air and stops in a yard or two.
The top guys are too good. I think most people underestimate their ability. My friend who shoots between -6 and -10 seemingly every round on a 7,300 course can't get his tour card.
It would be great to see this for real. I guess the closest we'll get to see is maybe the Walker Cup at Cypress Point. I've gone through the holes with someone who has a shot at making the team and the course doesn't require much of his bag as it would mine. In fact, my suggestion for him would be to go from 3 wedges to 5 wedges.
I just got to watch half the Tour play my course in Houston from close up, two weeks ago. You don't have to tell me those guys are really good, but nobody came close to averaging -4 on the three par-5 holes each round. Here's how the leaders fared on the par-5's:
Carlos Ortiz: 8 birdies, 4 pars
Hideki Matsuyama: 8 birdies, 4 pars
Dustin Johnson: 3 birdies, 8 pars, 1 bogey
Brooks Koepka: 6 birdies, 5 pars, 1 bogey
Making eagles is hard. I think Augusta still gives out crystal to players for every eagle. How many players have ever made three 3's on the par-5's there in one round, in 85 years of trying? [I looked it up ... Dustin Johnson was the first ever to do it once, in 2015. The most eagles in one tournament by a single player is four.]
It's just like your buddy who shoots between -6 and -10 seemingly all the time. He sure doesn't do that when he is trying to qualify for the PGA Tour, or he would be out there kicking everyone's asses.
Years ago GOLF DIGEST was computing handicaps for the PGA Tour players, and the best of them were a plus-6 or a plus-7 . . . for their best 10 rounds out of 20, against the course rating, not against par. Let's say it's plus-8 now. I don't know what the course rating would be for this imaginary 6400 yard course . . . Cypress Point's is 72.4. I really have a hard time seeing a guy shooting four 62's there, he would have to be on a hell of a roll. If you'd said 35-under, I wouldn't have objected.