Arch is aimed at people who know their shit so they can build their own distro based on how they imagine their distro to be. It is not a good distro for beginners and non power users, no matter how often you try to make your own repository, and how many GUI installers you make for it. There's a good reason why there is no GUI installer in arch (aside from being able to load it into ram). That being that to use Arch, you need to have a basic understanding of the terminal. It is in no way hard to boot arch and type in archinstall. However, if you don't even know how to do that, your experience in whatever distro, no matter how arch based it is or not, will only last until you have a dependency error or some utter and total Arch bullshit® happens on your system and you have to run to the forums because you don't understand how a wiki works.
You want a bleeding edge distro? Use goddamn Opensuse Tumbleweed for all I care, it is on par with arch, and it has none of the arch stuff.
You have this one package that is only available on arch repos? Use goddamn flatpak and stop crying about flatpak being bloated, you probably don't even know what bloat means if you can't set up arch. And no, it dosent run worse. Those 0,0001 seconds don't matter.
You really want arch so you can be cool? Read the goddamn 50 page install guide and set it up, then we'll talk about those arch forks.
(Also, most arch forks that don't use arch repos break the aur, so you don't even have the one thing you want from arch)
Any windows power user or dev on a mac can follow a wiki, read a bit and learn.
Good for beginners? I didn't describe a beginner right here. Anybody with experience in computing will find arch straightforward and satisfying. Heck, a CS student would probably go through a first install process faster than I do after 5 years.
What are the concept involved? Partitioning, networking, booting... These are all familiar fields to tons of very normal computer users.
Arch can be a good first distro to anyone who knows what a computer is doing (or is willing to learn)
You're focusing too much on the installation process, if installing Arch was the whole of the problem things like Endeavor would be a good recommendation for newbies, but they're not. Arch has one giant flaw when it comes to being beginner friendly, and it's part of what makes it desirable for lots of us, and that is the bleeding edge rolling release model. As a newcomer you probably want something that works and is stable. Arch is not, and will never be, that, because the core philosophy is to be bleeding edge rolling release. If you're a newcomer who WANTS to have that and doesn't mind the learning curve then go ahead, but Linux has enough of a learning curve already, so it's better to get people started with something they can rely on and afterwards they can move to other stuff that might have different advantages/disadvantages.
We're talking about the general case here, I've recommend Arch to a newcomer in the past, he was very keen on learning and was happy with reading wikis to get there stuff sorted, but realistically most people who're learning a whole new OS don't want to ask questions and be told RTFM, and RTFM is core to the Arch philosophy.