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> You must also reboot to upgrade sysvinit.

The whole point of the article is that you don't need to upgrade sysvinit or another minimal /sbin/init like those found in the BSDs.

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The argument is kinda weak given how many kernel updates are there and how often they come (and kernel upgrade _requires_ reboot regardless of PID 1).

Not necessarily. Ksplice[1] for example allows the kernel to be upgraded without rebooting.

[1] https://www.ksplice.com/

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