If one thing was clear at Broadband World Forum (BBWF) in Berlin last week, it was that nobody can afford to be religious about their choice of broadband technology any more. Fiber, copper, wireless – all of these will not just be used in parallel by the same operators, but will increasingly be converged under access-agnostic platforms to support network slicing, network-as-a-service and software-defined access. In this scenario, some of the arguments about the survival of copper, and the pros and cons of G.fast, already sound old-fashioned. G.fast is not fiber, but it is hard to imagine it will not play a valuable role for many operators. While the UK’s BT and Germany’s DT have been early trialists, G.fast is…