You could switch all your repos to the core Arch ones. I did that by accident once, and it was fine (although, I did switch them back eventually). Maybe it’d add release stability? I’m not really clear how the EOS repos vary off the baseline, except by adding some custom packages.

They don't afaik. EOS uses Arch's repos directly, unlike Manjaro. Just adds its own on top for all the fancy EOS stuff. Which is why EOS was immediately affected by the grub meltdown and not Manjaro. (which kinda digs a few holes in the stability hypothesis, though Manjaro is another kettle of fish tbf)

Snapper sounds really interesting, and I didn't expect "super easy" to be the feedback there. Sounds a bit overkill for my use case at home but I might look into it for work. Thanks for the info!

Oh god a borked BIOS is my nightmare... I don't even know how you'd go about fixing that on a modern PC mobo... Let's not jinx it shall we?