Real world fedora atomic distro security?

Atomic just means the update won’t complete unless it completes successfully. So if it fails at any point it’ll revert to the previous version and you won’t get any partial updates. I don’t think anything about atomic updates implies you need to restart. Fedora explained in a previous blog post how a lot of Linux distros don’t restart when they update and how that’s kind of dangerous, and why they do restart for updates.