"This is the way we have always done it so it must be correct!" != "This is the way we have always done and it works perfect for everybody!"

I want to use env vars because:

* I want to reuse builds and my systems have different behavior on different environments.

* I want to override the default config sometimes

* I don't want to expose sensitive configurations, and yet have them explicitly configure in my project configuration

The post it's very opinionated and lacking any valuable point IMO.