Fedora Silverblue was released alongside Fedora 30, which was 5 years ago; it is not “untested”, in fact it is quite extensively tested by its userbase. It also is not in beta as you claimed previously, its release with Fedora 30 was its full release, after the betas with Fedora 29. Atomic desktops have been around for longer than that, however. They are far more tested and reliable than you seem to be giving them credit for. In fact, they are far more stable and far more resilient because you can simply roll back changes when you boot. A few previous versions of the entire operating system are available to boot from in GRUB, and it’s as simple as booting into a previous version if a new one has issues. It’s actually the perfect use case for a school computer lab, because each install is perfectly consistent, can be managed and fixed easily if anything were to break (if that were the case then the OS would have broken in non-atomic versions anyway), and nothing the user does will affect the base image of the system. The base image doesn’t change unless it is updated. You can overlay things overtop of the base filesystem, but the base filesystem stays the same, so those overlays can be easily reverted.