I like Mountain Lake...more than Oak Hill West.
Regarding Oak Hill East and the recent changes to the 5th, 6th and 15th greens, rather than speculate the membership's actions over the years, your source there should be Craig Harmon. I know that for the 1989 US Open, those greens were way out of character than all the others. Seems like there were some other changes that involved the 4th hole (perhaps changing it from a par four to five?). There was no flow on the course except for 7-14.
USGA has apparently given it to the PGA (as it has Whistling Straits, Medinah, Hazeltine, Bellerive, Baltusrol, Atlanta Athletic, etc.,).