I do not agree with you at all and I think your analogy is wrong as well. For a VPC I'd never use v6 unless an application is explicitly requires it.

I recently set up infrastructure where all VPC communication is happening over IPv6. The only part that doesn’t is IPv4 communication with Docker but that’s because Docker + Kamal doesn’t have good support for it yet but work is very much ongoing for it. IPv4 was set up along side it but is not actually used. This took maybe minutes, if that, of additional effort. It runs a mature production project. And like chances are you are smarter than me so what exactly is your excuse?

I don't do work that could complicate my life. KISS is a very important principle.

I assume you don’t use passwords or set up encryption because that is not simple either.

This isn't how KISS works