Doesn't the penal nature of certain features of a course cause you to adopt a strategic approach? After all, if there were no penal features, why would you have to play strategically?
For example, if I can hit the ball over a bunker and gain a better angle to a hole, shouldn't the bunker, by nature, be penal in order to make me think about that approach vs alternatives or I would always give it a go as there would be nothing to lose.
Having watched 10 players up close playing Oakmont last week, I can say that the only hole where they all hit the same club from the tee was #7, where all of them hit driver. Even the par 5s had some players who knew they couldn't get there in two hitting 3 wood. I was surprised by the number of irons or hybrids I saw hit on long holes like 1, 9 and 15. 18 was all drivers or 3 woods.
Moving the tees up on #2 on Saturday and Sunday led to three different plays from the four players I had. One drove it into the greenside bunker (and it looked like he was aiming there), two more laid up short of the center bunker, one with a 3-wood and one with an iron and the fourth player laid back to where the usual layup from the back of the tee was to the left of the first bunkers with a very short iron, possibly a 7 or 8.
With the tees back on Friday and Saturday, 5 of 6 laid up to that spot, while the other took driver and hit it just short of the center bunker. He was 9 over starting that day and played more agressively trying to make some birdies.