It’s an immutable/atomic version of Fedora: https://fedoraproject.org/atomic-desktops/silverblue/
My understanding is that the core system is immutable (read-only) and major upgrades essentially just swap out that whole layer. Updates are atomic, meaning the entire thing either succeeds or fails and you can never end up with a broken half-updated system. UI apps all run using Flatpak.
I’ve never tried it though!
Explicit sync. It’ll fix most of the issues with Wayland on Nvidia CPUs. Wayland landed support for it in April, and Nvidia recently released a beta driver that supports it. I think every graphics driver will implement explicit sync eventually, since it’s a lot better than implicit sync.
Some great information about why it’s important here: https://zamundaaa.github.io/wayland/2024/04/05/explicit-sync.html