Most people don't know this, but speed bumps are actually hollow. They use a balloon to make the shape, then pour a thin layer of asphalt over it for aesthetic reasons. This saves money on asphalt, which is popular with city councils, so the asphalt is typically saved for more speed bumps rather than filling potholes.
Arch isn't unstable, I just keep breaking things in my ignorance. The only thing in this scenario I could pin on Arch is that the "ca-certificates" package should have been marked as a dependency for pacman, but I guess it's not strictly a dependency, as you can use pacman to install stuff from a local repo. Definitely for Firefox, though, as you can not browse the internet without the certs.
Could be, seems to me that BTRFS didn't match the subvolid between @home and what it expected @home to be in the fstab, but I won't claim to be an expert lol
Separate partitions for / and /home, save all your data, configs, etc. but you can still distrohop!