The difference with Oakmont and most courses that host pro events is that they keep their greens fast all the time. If you have a course that they want to be able to run greens at 13 for a tour event, but keep them at 10 for normal play they are going to be boring greens when you play them at 10. You can't have greens that are interesting at 10 that are still playable at 13. You end up with flatter greens that lack interest for day to day play.
I have nothing against the idea of fast greens, it is the idea of greens that are only fast for certain occasions but are kept significantly slower most of the time. I'd rather have them be at the 'slower' speed all the time but have contours designed for that speed, so they are actually fun to putt and require some imagination and ability to handle 6 foot putts that break 4 feet.
This is completely backwards, Doug.
Older greens have a big variety of slopes -- Oakmont's have spots that are only 2% or 3%, and other spots that are 4% and 5% and 6%. In the old days, you could use the areas up to 5% for tournament play, because the greens were only 9 or 10 on the Stimpmeter. Now that they are more than that for everyday play, all of the latter hole locations are obsolete, and you can only use the ones in the flattest parts of the green.
But you could have hole locations that were JUST AS DEMANDING TO PLAY if the greens were a bit slower and you were using the steeper parts of the green.
The search for "championship conditions everyday" is the ruination of many courses, and frustrates more and more golfers into quitting the game.