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Principal Skinner on Immutable Distros
(infosec.pub)
NixOS is a Linux distribution built on top of the Nix package manager. Its declarative configuration allows reliable system upgrades via several official channels of stability and size.
This community discusses NixOS, Nix, and everything related.
I'd say that the upfront costs of administration are too high for most people's use cases too. It's the same reason why most people don't document most of what they do, most of the time it's the right decision and it's hard to tell what the exceptions are until after you forget what would be in that documentation.