I would imagine that the role of an architect above all else is to help a golf course/club fulfill its purpose in the best way they know how.
Old Macdonald- build a course for everyone that can allow the golfer to see and play on some of C.B.'s great concepts based on many famous template holes and show how great width and green contours are when trying to have fun on a golf course
ANGC- was built to challenge the worlds best golfers in an invitational tournament. Heck, if they didn't tweak Augusta with this purpose in mind, it'd be weird, right? There are some things that could be changed, or changed back, but they've always seemed to make changes with this purpose.
Pinehurst #2- a championship test within the original Ross courses. Do we know how raised the greens were originally? Does it matter? It's been restored to once again champion fast and firm conditions, short grass and sand, and provide a test for all levels of player. That'll do!
TOC- defining the purpose of TOC is much more difficult than these other courses (which I probably haven't fairly summed up in 1-2 sentences). It's the birth of the game; the greatest link to golf's origins. It has many of the most copied strategies, concepts, and features that are seen in the game. The result is that it does indeed need to be preserved, but I'd imagine that for every golf course there is a unique need that the golf course architect needs to fulfill.
So the question is...is TOC starting down the road to becoming ANGC?