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But how much of it is inherent complexity?

Only the pid 1 sigchild handling. Everything else is design choices.

About 0.1% is inherent complexity

The Linux kernel is simply too complex.

Which part? Just saying systemd is like saying a distribution is too complex

As a user I can say that journald was a mistake, if you try to reinvent a database, you will reinvent it poorly and journald wasn't an exception.

I may be wrong but he was probably hinting at systemd being a constellation of too many parts.