No package manager before Nix solved the whole problem at all. Nix is the first of its kind. A good litmus test: install the gnome and the kde desktop envs on

No package manager before Nix solved the whole problem at all. Nix is the first of its kind. A good litmus test: install the gnome and the kde desktop envs on your linux system with your preferred package manager. Now remove both. Will you get back to a fresh install state? And it’s not even a hard problem yet. Now how would it solve installing a second chromium browser that uses a patched libc beneath?