Below is the original text with reasoning and an updated list of remaining packages to be updated.
are plenty of Python packages in Fedora currently using setuptools at
buildtime but not all of them are BuildRequiring it explicitly. This
only works because python3-devel (transitively) depends on
would like to kindly ask you to add explicit BuildRequires for
python3-setuptools to packages where setuptools is used. It will help us
with testing new versions of setuptools in the future or with
decoupling Python and setuptools. Today, if we want to know if a package
is using setuptools, we have to do `fedpkg prep` and use grep to search
for setuptools. Using a repoquery is much more convenient.
packages can successfully build either with or without setuptools (they
use try-except import and fallback to distutils from the standard
library). Such packages are especially dangerous when not BuildRequiring
setuptools -- they can produce different results depending on the
presence of setuptools: either an .egg-info metadata directory
(w/setuptools) or .egg-info text file (w/distutils). RPM has troubles
when upgrading directories to files .