I use NAT for security, because it's a constant confirmation that my stateful firewall is working as expected and hasn't been accidentally turned off for some reason.

@kwf Fun Fact: NAT was created to quickly get companies onto the Internet without renumbering from whatever public IP space they squatted on.

https://youtu.be/GLrfqtf4txw

THE UNTOLD STORY: How the PIX Firewall and NAT Saved the Internet

YouTube