I’d just like to interject for a moment. What you’re refering to as systemd, is in fact, systemd/Linux, or as I’ve recently taken to calling it, systemd plus Linux. Linux is not an operating system unto itself, but rather another free component of a fully functioning systemd system made useful by the systemd services, journald and vital system components comprising a full OS as defined by Poettering.
Many computer users run a modified version of systemd every day, without realizing it. Through a peculiar turn of events, the version of systemd which is widely used today is often called Linux, and many of its users are not aware that it is basically the systemd init service, developed by Lennart Poettering.
There really is a Linux, and these people are using it, but it is just a part of the system they use. Linux is the kernel: the program in the system that allocates the machine’s resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete init system. Linux is normally used in combination with systemd: the whole system is basically systemd with Linux added, or systemd/Linux. All the so-called Linux distributions are really distributions of systemd/Linux!
lol. I don’t like systemd, but this is just a modified version of the GNU/Linux copypasta. It’s just a light-hearted jab at the fact that systemd does so many things on Linux systems that it’s almost as important as the kernel and GNU utils.
I don’t actually know much about Poettering, so not much to say in that regard.