Well, in my experience, systemd has much worse documentation, is very inconsistent (or you could say it is constistantly brain-dead), and extremely unreliable and unpredictable, since it often hangs when shutting down and rebooting.
The bright side is this is all logged, trivially grep-able, and easy to fix.
If you have 20+ years of experience, you’ll will NEVER get it to work the way you expect, might as well install Gentoo.