I strongly disagree. PID1 is a single point of failure for the entire system. If it crashes, the kernel will immediately panic. Try it out yourself and see.

I strongly disagree. PID1 is a single point of failure for the entire system. If it crashes, the kernel will immediately panic. Try it out yourself and see. A good design would move every last bit of complexity out of PID1, leaving PID1 doing the absolute bare minimum required. There is no need for the vast majority of systemd's functionality and complexity to be physically present in the PID1 image. They could fork off another process to do that. I've always found that aspect of its design to be utterly bizarre. Jamming additional complexity into PID1 is fundamentally wrong, it's obviously a poor engineering choice, and there are plenty of better ways of architecting the system.