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But of course (I guess like various C++ feaures), it's also terrible if people actually start using this IRL. In particular in systemd this is has brought a repeating theme of breakage to us.

The systemd service manager (aka "PID 1") runs very early at boot, it is after all typically the first userspace process invoked on a system. This means it initially runs in a very minimal execution context, for example /proc/ and /sys/ are typically not mounted yet, there's no /tmp/, and nothing else.