Kamala Harris famously advocated for banning fracking, co-sponsored Medicare for all, endorsed a mandatory gun buyback program, etc.
Of course she changed her views when running for president, but she had a very short time to actually convince voters that she’s moved to the center
The Nix package manager uses systemd for instatiating services for its packages, so you can switch between any setup with one command. Nix will stop and start all the units that were changed. While it’s a Nix feature, systemd is doing all the heavy lifting