Easy to also overlook that if any other engine failed the one that was shut down to conserve fuel could just be restarted if need be for performance. This is not an engine failure, its a choice to shut down to allow that engine to be available for a normal approach and landing at the destination due to fuel constraints.
Definitely mountains of molehill stuff, although a good example of thinking outside the box to get the job done safely.
Also it was flying Anchorage to Miami, its basically within an hour of a suitable landing port the whole journey. Not sure what the issue is here?