Nope, that is just a form of NAT one is forced to use for IPv4, with a stateful session table. It is that session tracking which adds the "outbound initiated"

Nope, that is just a form of NAT one is forced to use for IPv4, with a stateful session table. It is that session tracking which adds the "outbound initiated" only behaviour. There is a form of NAT for IPv6 (NPTv6) which can be used to gain pseudo provider independence. It has static mapping rules, with no session table. It allows for "inbound initiated" sessions. So it is NAT which is globally reachable, without the endpoint addresses being globally routable.