Silverblue is pretty great. But it's really been taken to another level in the last few months since it started allowing you to _boot_ from a container image. That means, you can have some automated container build somewhere that you point rpm-ostree too which gets automatically pulled down to all your machines. It's like building your own distro, but without any of the work. Here's mine, for example:

https://github.com/pkulak/filverblue/

And then, of course, I _also_ have an automated Arch build that I use with Distrobox on top of my custom Silverblue build. I get the stability of an immutable OS layer with the easy installs and package availability of Arch.