Currently fontconfig has a dependency on font(:lang=en). For minimal setups where fontconfig is involved in that don't specify anything more specific than that, it results in getting the first satisfying package by alphabetical sort order to be installed. At the moment that is aajohan-comfortaa-fonts, which is not a very good default, and could change based on what names of packages are available. Instead, I suggest adding (in addition to the existing hard dependency on font(:lang=en)) a Recommends that would by default (with dnf) pull in something that is a better default and already a default in common Fedora installations, such as abattis-cantarell-fonts which AFAIK is the default for GNOME. Some other potential candidates would be liberation-sans-fonts and dejavu-sans-fonts. Not sure if Suggests would work for this purpose, or if it needs to be Recommends.
Sorry, missed this one. I tend to agree with the concept of the idea. but I want to move the interests of the discussion about what we should default to the outside of fontconfig, because, dunno how often/many we will have such discussion after implementing this idea into fontconfig though, rebuilding fontconfig to apply the changes is a bit higher cost. that would be better having a meta package or virtual package to do that and just require it in fontconfig.
added Suggests: dejavu-sans-fonts to fontconfig-2.13.0-6.fc29