The new defaults allows jenkins-job-builder to reload the configuration out-of-the-box, whereas the previous defaults required users to manually reload/restart jenkins, or configure accessUser/accessTokenFile themselves. (If `extraJavaOptions = [ "-Djenkins.install.runSetupWizard=false" ]` then the initial admin user is *not* created and you have to use JCasC or something else to bootstrap.)
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.