Comment by deknos

Of course it's not insecure because of NAT.

NAT (in all its forms) is just a very convenient technology for many people and niche situations.

And adoption of IPv6 will be hindered as long as NAT is not a first class citizen.

And of course, mostly NAT should not be used as "firewall replacement". But what many firewall proponents forget here:

NON-IT People at home cannot run and manage a firewall (and proxies). For them, NAT is a convenient and mostly okayish replacements.

Another niche would be IP Packet Handling of VMs.