there is no proprietary AMD Linux driver

I mean, there is. It just isn’t recommended for most users.

FYI: If you aren’t aware, Arch has a CLI installer now that is very easy to use, should you ever want to give it a try (archinstall)

Endeavour is basically Arch with a more user friendly installer, a very small number of their own packages, and a coat of paint.

Manjaro is similar, except Manjaro runs their own repositories and delays packages for testing. This can lead to a whole bunch of issues when combined with the AUR. The team leading it has also been shown to be a little inept at times. I wouldn’t personally recommend it.