Comment by dspillett

> NAT provides security because normally it disallows external actors on the outside from accessing resources on the inside side.

Any good firewall does the same, by having a default “no” rule for incoming connections.

> A firewall is not required for NAT to work

Do you have any examples of NAT that isn't implemented in a more general firewall subsystem?

> NAT effectively reduces the attack surface for a home network to the router.

While true, this doesn't add to the argument for/against IPv6. That is just security provided by default configuration, which can be provided many other ways and could be before the subset of NAT you are talking about was common.