>>109652003
https://fedoramagazine.org/offline-updates-and-fedora-35/
tl;dr Microsoft was right and blindly upgrading random program files while old versions are still running has unpredictable results. Only online upgrade stuff if you understand what'll happen.
>but what if I miss a CRITICAL security update
You're still missing those because you never restarted the whatever program had the vulnerability.
dnf check-upgrade --advisory-severities=critical --changelogs
Have a systemd timer that mails you reports on this if you want. Discover also highlights these and changes the color of the notification bubble, iirc. For most people the only thing that has them with any frequency is their browser.