Which can be done via UPnP and PCP, and without having to maintain TURN/STUN/etc infrastructure. The latter of which can only be done with IPv6, since with IPv4

Which can be done via UPnP and PCP, and without having to maintain TURN/STUN/etc infrastructure. The latter of which can only be done with IPv6, since with IPv4 you're NATing. So IPv6 makes things easier—which was the point of my post: IPv6 makes things easier.