I didn't know Lennart Poettering was on fedi. Started reading a thread about D-BUS and as soon as I read the word I said to myself: I bet the systemd people are going to replace it. And what do you know, a dozen posts later, there it is.
I mean, I just read this stuff out of mild interest because I use Debian and Debian uses systemd and a few years back I started writing service unit files for the things I do and it wasn't too bad. I'm still in the process of migrating them over, though. Not all of the services I run have switched.