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I believe the Oakland Hills restoration is to try to bring the Golf Course back to as much Donald Ross as possible although others may have more details.
Beginning in 1951, Robert Trent Jones made significant changes to the bunkering throughout the golf course and a lot of trees were planted over time. Other architects such as Arthur Hills left their mark.
Thankfully, my understanding is that most of the green complexes have gone untouched through the years so that's a big start for them.
From a philosophical standpoint, I really don't have much problem extending the golf course where possible in terms of length, particularly if the original angles of play can be maintained because to do otherwise would deny the fact that Golf Course technology has really gotten out of the bottle in the last few decades in terms of overall distance and even overall straightness.