In environments like hospitals, needing only one cable and one jack, I think this is a major advantage. Techs only need to unplug/plug one cable, there is less cable to get cluttered up, you only need half the amount of different types of cables in stock (no more different power and comms cables), ...

When renovating a section of a building, you only need to put in one new jack; that's half the cost saved, because you only need one guy running cable, not two (often different companies run electricity and network cables). So it's a major saving in installation costs.