I wouldn't even say that's so advanced. I've got a similar config (not published, sorry). All built from source, with the resulting binaries pushed to less-trusted hosts. My cloud servers, router, wifi APs, Kodi boxes, etc, all running self-hosted self-built software with config kept in git.

Previously I used to run Debian across my setup (with a homemade configuration templating/distribution tool) but it feels like Nix really bundles up the accidental complexity of most software in a contained way, much more than a traditional distro.

I'll be much happier when Nix gains full reproducibility and functionality like Guix's `challenge`. But even now it feels like one of the closest implementations to the Free Software dream.