Well, for my world it’s interesting because the passenger seat is just that. But before the evolution of tech and everything else heavily affected travel, the front passenger seat held importance in that the one who sits there can assist in reading a map, adjusting the passenger wing mirror, monitoring the side directly while parking or other tight manoeuvres, emotional support for police stops, handling a drink so the driver can hydrate without endangering anyone, an extra pair of eyes on the less vital areas etc… Now these benefits of a primary passenger are almost nonexistent