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I think it's more likely an example of some divers getting narced. The only thing that will prevent that is some He in the mix.
Adherence to training and dive planning underwater is a diving fundamental irrespective of who you are.
I'm not arguing that there should be a mandatory dive for nitrox or that Nitrox should be a mandatory option in AOW but using Nitrox can have consequences on a dive and I'm just giving a loose example of how some divers can get complacent.
I think it's more likely an example of some divers getting narced. The only thing that will prevent that is some He in the mix.