It's an entire middleware layer that sits between userland and the kernel that we did not have before.
The distinction being?
Edit: I'm out of my HN comment quota but kind of glad I am. Because I'm clearly not going to get anything productive from a thread where I wonder aloud why systemd is classified differently and where that distinction lies. When does an init system become middleware "that we didn't have before?" I can think of a few answers but was curious what others think. Fuck me, right?
Instead, ask a question, get snarkily called obtuse and downvoted because we have the misfortune of systemd being the topic of conversation. History shows us you might as well not even participate; if all the people who argued about systemd invested that time into productive activities we'd have warp drive by now. Which would be useful to flee systemd threads.
I swear, systemd is tech's abortion debate.