Every Ipv4 device has a loopback (well most do.) thats not what they are on about. Having NAT and a firewall gives you a better illusion of privacy. Sure you c

Every Ipv4 device has a loopback (well most do.) thats not what they are on about. Having NAT and a firewall gives you a better illusion of privacy. Sure you can track devices from the outside world, but its pretty hard. If you have v6 configured in a certain way, then your IP address is basically a UUID for your machine. Plus you can't really just stop ICMP anymore so you can trivially ping it (caveats apply)