Somewhat related recent curiosity: Is there anything new about 5G tower/backhaul infrastructure for edge computing that wasn't already feasible for 4G?
That enables edge computing by allowing traffic for the edge computing node to be routed to the local edge node directly, without it going down the backhaul.
This is very much a software change though in the implementation of the base station.
Backhaul is becoming less and less of a problem as more and more sites get fibre backhaul. Point to point links can easily do 10gig/sec now even if they don't have fibre (to another tower with fibre). That is almost certainly as much if not more than the total capacity of most cell towers even with a stupendous amount of spectrum allocated.
The problem with backhaul isn't the availability of fiber, it's the _concentration of bandwidth_.