[privateSFacct]

That's not all that IPv6 changed. There is a reason even places like google cloud have not implemented ipv6 (and these are huge scale players). They changed so many things around the protocol that you need new firewall experts, new configuration experts etc etc

[hkt]

That's right: network engineers who speak IPv6 reliably enough to deploy it are rare. Network engineers brave enough to deploy V6 only are even rarer.