Rebuildable is different than reproducible. The Nix system is predicated on rebuilding. Ideally the binaries would be all also reproducible however it turns out

Rebuildable is different than reproducible. The Nix system is predicated on rebuilding. Ideally the binaries would be all also reproducible however it turns out making compilation completely deterministic is actually pretty hard. When we reach that point and me and you can both independently produce identical binaries and hash them from exactly the same source code that is beyond fantastic for security and auditing.