At my last job we designed a lot of wireless devices. One problem we saw frequently was that in high population-density areas, e.g., apartment buildings in NYC,

At my last job we designed a lot of wireless devices. One problem we saw frequently was that in high population-density areas, e.g., apartment buildings in NYC, Bluetooth was often useless because there was simply so much interference from so many devices in a small space. Wired communication definitely still has its place.