[pmarreck]

Linux namespaces and Nix closures solve different problems at different stages of the software lifecycle. Namespaces isolate running processes; Nix closures guarantee build-time determinism and reproducibility across systems.

Namespaces don’t track transitive dependencies, guarantee reproducible builds, enable rollback, or let you deploy an exact closure elsewhere. They’re sandboxing tools—not package management or infra-as-code.

If anything, the two are complementary. You can use Nix to build a system with a precise closure, and namespaces to sandbox it further. But calling namespaces a "more complete solution" is like calling syscall filtering a replacement for source control.

Also, minor historical nit: most namespaces existed by the late 2000s; Nix’s whitepaper was written after that. So the premise isn’t even chronologically correct.