The bottom line was that IPv6 did not offer any new functionality that was not already present in IPv4. It did not introduce any significant changes to the operation of IP. It was just IP, with larger addresses.
There was no need to give the transition much thought. Internetworking wonks assumed applications, hosts, and networks would become dual stack and support IPv6 alongside IPv4, before phasing out the latter.
We could either concentrate our resources on meeting the incessant demands of scaling, or we could work on IPv6 deployment. Achieving scale rose to the top of to-do lists.
Content providers, seeing the persistence of IPv4, didn't bother to adopt IPv6 - meaning network operators didn't need to, either.
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