It's an entire distribution and they do not just rely on the Archlinux servers too. I mean this is what a distribution does after all. The point of a distribution is to package Linux with predefined set of applications and configurations into a full fledged operating system. Archlinux itself requires lot of manual steps and knowledge to make it ready for the end user. That's why there are distributions like Omarchy, CachyOS, SteamOS and EndeavourOS, all with their own spin on Archlinux.

If you don't like it, fine, but its unfair to downplay their work. I personally think second class distributions in the sense of a "spin" or "flavor" are important too. Especially because it makes it easy to get into for newcomers, and it makes it just less work for anyone who knows but is lazy to do all the steps. There is value in these distributions. No one forces you to use them. It's not just "dotfiles", if you look closely, you see bunch of conversion scripts and a personal identity with a focus on a specific style.