Penguin,
With all due respect, I don't think Chris Brands is the first person to think about how the game was played then versus now. While interesting, this is an obvious fact. And if 12,000 yards today is the 6,300 yards of, say, 1900 (or whenever)... so what. Maybe 6,300 yards was too long then?!
8,000 yards at the Prairie Club though? Like places such as Kiawah and Whistling Straits and Erin Hills, I presume they've constructed this 8,000 yards set of tees more for variety (dealing with different winds) and potential flexibility into the future than to actually set the course up at 8,000 yards on any given day.
That would be ridiculous, considering I suspect a majority of prospective Prairie Club golfers need about 6,200 yards max. to enjoy golf in that environment (as you know, I've been there).