Because systemd (the project) extends more than just systemd (the init system). It also includes things like:
- systemd-journald (system logging)
- systemd-timesyncd (Network Time Sync)
NetworkManagersystemd-networkd (network interface/connection management)- systemd-homed (Home directory management)
- systemd-resolved (DNS Resolver)
and so many more
Now, in my personal opinion, I do find it good in that these being under one umbrella project led to fairly good integration between these aspects of "system management" as a whole. But I do also concede that this may feel like too many responsibilities handled by one project