I only learned about that a few days ago, here on HN (some thread or some old comment).
It is completely insane and gives lots of fuel to the systemd haters.
I do run both Debian (systemd) and Devuan (a Debian fork with all the systemd stuff removed). I use Devuan on my main desktop PC and I've got exactly zero problem.
That's the thing: many "sell" systemd as some mandatory machinery but it simply ain't. Ultra-light containers (like Alpine-based ones) run fine (and faster) without systemd. Desktops do run fine without systemd (I'm running Devuan on my workstation and Debian on my laptop: it's basically the same experience). For certain types of servers I can understand some see benefits in running systemd.
Neither IBM / Red Hat nor Microsoft should be those setting the terms of what is or is not an acceptable "PID 1" for Linux.
The day Linux becomes "systemd Linux" is the day I'll switch to a BSD.
I don't mind that systemd exists as long as people still have the choice to run a non-systemd Linux. The kernel should be orthogonal to systemd and there should be Linux distros packaged without systemd.
And systemd proponents shouldn't go out of their way to try to prevent non systemd Linux from existing.