After reading all this, and generally being predisposed towards Arch since my experience with EndeavourOS has been rather comfortable so far^1^, I'd say I've less been rationally convinced of using it, but rather not deterred enough. So I think I'll just go with Arch, but make sure to keep my home folder in a separate partition, so I can bail if needed, with Fedora as my preferred backup.
1: Well, I say it's been comfortable for me, and that's true, but a friend of mine who installed EndeavourOS at the same time as me recently booted his pc up to find a terminal staring back at him. He says he didn't do anything weird, and didn't even update, but who knows. If I understood him correctly, reinstalling (one of) the Kernel(s) (I think he has two installed, one as a backup) fixed the issue. Problem is that this takes time, and when you're not home, with shitty or possibly no wifi, that's gonna be a big problem.