For some reason, the maintainer behind the “*-infinality” packages in Arch Linux “has gone missing” for a while.
Why is that important to me? Because infinality is a patch set to a bunch of font and rendering packages, which make fonts under Linux look SO much better than the default setup. (Yes, there are still a couple of things that Linux just absolutely cannot compete in with Mac and / or Win, and font rendering is one of them. Ubuntu does a reasonable job of this, every other distro just sucks.
Except when you were using infinality. And now it’s defunct.
Anyway, after experiencing the unbelievably ugly phenomenon described in here, I tried this guide here now, and it seems to fix it.