It's simply because there choose to store the code of multiple applications in the same repository. There is already a lot of projects that do the same since a long time.
Then show to us what's we don't want to see, and explain what UNIX philosophy systemd breaks.
I don't give any credit to your conspiracy theory. Yes systemd is now a dominant component of the last distributions, like udev, dbus, xorg, NetowrkManager when there was introduced into the distributions at there time. This don't make them evil projects with the goal of controlling the ecosystem. An other example is git that have largely take over the others SCM in the open source community, do this make it an evil project that control an ecosystem? From the reactions I read, even get the feeling that it's just a few systemvinit fans that try to control the Linux evolution to keep them in the past forever.
Yes systemd is designed to make the maintainers work easier, your analysis is correct. Now what's broken for the users of systemd?
I don't comment on the RH support, as I only use Debian distribution or derived from Debian.