Installing Arch Linux on ZFS has always been a non-trivial task: you need to know many nuances, read tons of articles and various wikis, understand dataset and pool creation flags, initramfs configuration, which systemd services to enable, kernel command line parameters, and proper configs. If installing manually, the installation takes a whole evening, carefully poring over manuals in front of a black console. (Small life hack: if you have a second computer, it's much more pleasant to install Arch from it by connecting to the target via SSH, precisely because of the ability to copy-paste commands).