Bobby Jones famously played left of the Road bunker in his match against Cyril Tolley in the 1930 Amateur championship. He was concerned about doing so, because he didn't want to be accused of using the large gallery to keep him from possibly going too far with his second and winding up in the burn -- he tried in vain to get the marshals to move the crowd back, for that reason.
That's the main reason you don't see that play tried a bit more often -- the burn is actually in play if you are trying to make sure you're clearly past the Road bunker. I am not surprised that IBF tried it, though -- he was taught how to play The Old Course by Peter Thomson and Kel Nagle, and he understood it very well.
I did think about it at Old Macdonald . . . obviously, we weren't going to build a burn to nowhere to prevent it. But I figured that the lack of a real road to the right of the green made the hole much more forgiving, so it wasn't necessary to beef up the left side defenses.