So, I am a fool who just spent a few hours trying to make my RPi run Arch. Unfortunately, I wasn't able to get it to boot; it either fails to boot at all, complaining about XHCI and bootlooping, or goes through most of the boot process before looping on "error -5 whilst initialising SD card".
It also seems pretty consistent that it bootloops about XHCI if I try to use fdisk to partition the SD card, and throws error -5 if I try to use KDE Partition Manager.
I also kind of wish that I could go anywhere useful to ask this question, but every question I have ever asked on any sort of tech site either gets completely ignored, or gets thrown out for not being a good enough question. :/