FreeBSD 12 has been active since last year. HardenedBSD 12 is active since last year. Suricata 5 has been active since last year. Opnsense has not been updated for over a month.
Some components such as unbound have security holes that have not been updated. Manjaro linux is not a security system and yet it is updated every week to the latest versions of its components.
Is it so difficult to do the same with opnsense? Even pfsense has already fixed the latest security patches: https://docs.netgate.com/pfsense/en/latest/releases/2-4-5-p1-new-features-and-changes.html