I believe the NAT instances also use super old and end-of-life Amazon Linux. I prefer Debian Trixie with Packer and EC2 instances and no EIP. Most secure, performant, and cost effective setup possible.

> NAT AMI is built on the last version of the Amazon Linux AMI, 2018.03, which reached the end of standard support on December 31, 2020 and end of maintenance support on December 31, 2023.