Filesystem enable age verification in pretty much the same way as systemd does: You can optionally store a user’s birthday. That is such a ridiculous statement.

To be fair: None of the other inits cared for udev. None contributed or helped by providing features they wanted to improve udev. The systemd devs care for the lower level plumbing overall… and not just for the init system. So it is very natural for low level plumbing projects to land under the systemd umbrella today.

Systemds track record wrt. security flaws is actually pretty good. Not many went through the cracks,maven though some were indeed pretty ghastly. Hardly any was in the core functionality, most were in new code not widely used yet.

On the other hand, the service hardening that systemd enables has improved the overall security of a typical Linux system by quite a lot.