That's true. I guess I see it as the difference between the system and what I'm doing with the system—it's like having a database system where I'd want the conf

That's true. I guess I see it as the difference between the system and what I'm doing with the system—it's like having a database system where I'd want the config for the database to be totally reproducible and immutable, but I'd expect to manage the data itself separately. And, as a practical benefit, I found setting up borg backups for /home on NixOS a lot easier than I expected :)