Interesting side effects of running #NixOS with flakes:
1. I can run a `nix flake update` + rebuild, even after months of ignoring a computer. No fear of breaking everything, since I can always roll back. I used to be really bothered by `apt upgrade` on stale environments.
2. I can run daily committed upgrades (still a problem in CI, since Github actions goes out of disk space, when doing so)