The Tacoma has a very similar mod, but I think this is really only needed if you do some SERIOUS mudding or fording water.
In the case of Nissan axles the vent thingie is prone to rusting or just clogging up and fails to release pressure, no hardcore offroading required. The mod is a nice little bit of insurance.
Buster have you looked at your axle? It has the little shaker cap vent? The '18 Titan has a hose and filter as it should but older models didn't.
Extreme example of rusted axle vent. Certainly could happen in Pa, maybe in NJ, unlikely in Az.