The system is up to date, with one exception: I held sane to version 1.1.1-2 because the newer version broke scanning from my HP AiO. But of course there are many tweaks.
I do use AUR for some packages, trying to follow this advice. The script probably was updated after I copied it.
Also, I did some adjustments for audio, following a guide from the user “ElizabethHarmon” (the link is now dead, I find).