Well, it's not obsolete - more incomplete. OpenBSD has supported ipv6 natively for a long, long time.
Additionally, with a "home/office" router, there's many ways that IPv6 may be implemented by their ISP (e.g. static configured prefix, DHCPv6, prefix delegation etc...) all which require specific configuration on the WAN and LAN side to make it work.
So, I agree, but splitting that particular part into a different FAQ/walkthrough is going to be a better approach.
Additionally, with a "home/office" router, there's many ways that IPv6 may be implemented by their ISP (e.g. static configured prefix, DHCPv6, prefix delegation etc...) all which require specific configuration on the WAN and LAN side to make it work.
So, I agree, but splitting that particular part into a different FAQ/walkthrough is going to be a better approach.