point point global bipartite graph connectivity with switching is incredibly more complex than RF cells. The last mile is where the complexity in telephones lie. It’s not in the complexity of the (again) science it’s the number of moving parts. Stringing wires between everything everywhere that can never be broken is much more complex than concentrating the wiring to backhaul lines at towers and devices connecting to the tower and negotiating over a cellular switching protocol. By using connectionless RF for the last mile you’ve dramatically reduced the aggregate machine complexity by orders of magnitude and improved the capabilities (truly untethered) dramatically.