They didn't say reproducibility, they said determinism. If you use a container with the same apt-get commands and the same OS, you already separate out almost

They didn't say reproducibility, they said determinism. If you use a container with the same apt-get commands and the same OS, you already separate out almost all the reproducibility issues. What you get will be a very similar environment. But it's not deterministic as you point out, that takes a lot more effort.