> Yes, the problem .env files try to solve is having "environment variables" be injectable from a file so that different applications can have different environment variables by default.

This seems like a misunderstanding: The `.env` file should be `source`d into the current shell (environment). The application reads values using whatever mechanism it uses to read these values from the environment. Nothing should be “injected” into the application, i.e. the application should not read `.env` directly.

(Not sure if you were just being loose with your terminology, trying to clarify.)