Part of the problem is that the underlying systems aren't Nix, so you're replacing the easy way with the Nix way. I wouldn't be mad if opening the system prefe

Part of the problem is that the underlying systems aren't Nix, so you're replacing the easy way with the Nix way. I wouldn't be mad if opening the system preferences and setting my timezone also updated my timezone in Nix. I am mad that I can't change my timezone when I travel, because the GUI picker doesn't know that Nix has taken ownership, so only changes in Nix take effect.