Just a point of speculation, but if the aircraft had been a hundred yards or so left or right of the course they tracked, there is a distinct possibility that they would have passed Black Rock in complete ignorance of the danger it represented.
Would a report even have been submitted, or would some later incident have been needed to highlight the problems uncovered by this investigation? I have a deep suspicion that there are a whole load of undiscovered gotchas just waiting out there to catch out the unwary.
Despite all the planning and preparation possible, flight safety is built on the misfortunes of those who preceded us into the air. I can't see that changing any time soon.