[generalizations]

A) I was responding to the implication that Linux+Systemd is the combination used in 'basically every commercial production system', which discounted the entire world of a) BSD and b) not-systemd. That wasn't a cron-specific comment on my part.

B) I do control my (professional environment) firewall. OpenBSD+PF is an amazing firewall combo, and the other common firewall, pfsense, uses FreeBSD. Neither use Linux; neither use systemd.