Comment by throw0101c

> I guess the point with this to facilitate usage of IPv6.

See §6, "Usage Examples": IPv4 over IPv6 Core, IPv4 VPN Unicast over IPv6 Core, IPv4 VPN Multicast over IPv6 Core.

* https://datatracker.ietf.org/doc/html/rfc8950#name-usage-exa...

So it's to facilitate legacy IPv4 usage when the rest of your infrastructure is IPv6.