Agreed and the conflation is somewhat intentional. When you install a system, you get all of that. Custom kickstart files can strip away some of it. For the longest time, you would get polkit regardless. The rpm spec file was changed about a year or two ago so that it can be removed if someone did not exclude it specifically. To be fair, each OS maintainer is including or excluding bits of systemd in the default configurations, so that is not entirely systemd's responsibility. Every year systemd appears to be subsuming more and more system functionality.