Tom Doak's statement regarding Oakmont and Pine Valley is accurate, while Tom Fazio's statement on Pine Valley is inaccurate.
As Tom said, other than tree growth, Pine Valley was essentially static for about 75 years.
The exception was the introduction of a second green on # 9, but, other than that, very little intentional changes took place.
I view the changes made in the last 15-20 years as a reactionary response to the quantum leap in distance over that same time period.
I don't consider "elasticity", or non-contrived lengthening as an architectural change.
Many architects incorporated that flexibility into theif designs.
TEPaul and Wayno can certify Flynn's beliefs on that subject.
Other than lengthening, flattening greens has occured in reactionary response to very high green speeds.
OK, so what has changed, architecturally, in the body of the holes, that portion between the tee and green that leads Mr Fazio to his conclusions ?
Narrowing of the fairways and the concurrent moving of the bunkers to match, ala Oakmont ?
Are these systemic changes ? Or, are they limited to courses holding major championships ?
If a trend occurs at major venues, but, nowhere else, is it a general trend in the golf world, or an anomaly confined to the PGA Tour ?