The main problem with NixOS that the author touches on is the isolation as well as the global state NixOS maintains for mappings in the nixstore which makes Nix

The main problem with NixOS that the author touches on is the isolation as well as the global state NixOS maintains for mappings in the nixstore which makes NixOS root unsharable over NFS. There have been talks on #nixos of creating a LKM, etc to fix the security issues with NixOS but there is a better way to deal with this and just treat the FS as a file system and not an object store like NixOS does, state could be encoded in the file system.