Wayland's nvidia support is improving over time, but although it's becoming less popular, X11 isn't likely to be completely deprecated anytime soon—I'd expect any mainstream distro to still at least have it as an option a couple of years from now, to handle corner cases Wayland still doesn't support.
The last X11 stable version bump on my distro was about a month ago, to 21.1.16, so it isn't like it's abandonware or anything.
Wild idea: check the condition of the SDD (presumably) that you're trying to install to. After all, an installation has two endpoints, and if the target disc is on its last legs and throwing SMART errors, it ain't gonna be too happy getting written to.
Did you make sure that Nouveau was not loading? If both drivers are on the system, Nouveau usually ends up taking precedence unless it's been blacklisted. Also, if this is a laptop type with a hybrid graphics setup, you may need additional software to manage the handoff between GPUs (optimus, bumblebee, etc.)
So, Poettering wants to make life difficult for everyone using something other than his precious again by transitioning from the normal standard for IPC to something hardly anyone has ever heard of or uses that's based on JSON? Seriously? 🤢
Distro best added to the "Power-user distros to avoid" list: Gentoo (saying that as a Gentoo user).
I disagree with your claim that doing things like installation steps manually is necessarily a bad idea, though. It depends on your goal. Obviously it isn't the fastest way to get things up and running, and as such it isn't appropriate for newcomers (or for mass corporate deployments). If your goal is to learn about the lower levels of the system, or to produce something highly customized, then it becomes appropriate. Occasionally, it pays dividends in the form of being able to quickly fix a system that's been broken by automation that didn't quite work as expected. Anyway, I'd suggest rewording that bit of your Arch screed.
Provided Fedora has the appropriate packages (and I expect they do), I can't see why not. But see if there's any distro-specific documentation on switching first.