It's also "best practice" to learn a new, foundational technology (like IPv6) sooner than later, perhaps less than 20 years after it was first available.
I know IPv6, just don't feel the need to use it. I prefer to have one firewall and public network interface to worry about. I can't disable IPv4 yet, so the logical solution is to disable IPv6.
Did I say they had to deploy it to production? If they deployed it in dev and test environments even a few years ago, they might have some experience deploying it in prod today.
