> Before systemd I knew exactly what gets executed, when and why -- which is exact reason why I switched to Arch many years ago. I don't know the same thing after systemd introduction.

Funny thing. For me systemd has turned that around. I had no idea what was going on in my system, but systemd allows me to easily visualize it, control it and optimize it.

systemd may not be the ultimate init system which all Unix/Linux versions will end up using, but I have no doubt a future init-systems will take a queue from all these things which systemd has done well.