We're using RFC 4193 space, which doesn't route globally, so we need to have a globally routable IP address if (and when) we decide to route onto the internet.

We're using RFC 4193 space, which doesn't route globally, so we need to have a globally routable IP address if (and when) we decide to route onto the internet. NAT6/PAT6 does that for us. For numerous reasons, (see a prior comment by me) we don't have a lot of interest in putting globally routable addresses on internal hosts.