Want to try something a little different? Bazzite was recently announced as a custom Fedora 38-based Linux image designed to bring the best Linux gaming to PCs and Steam Deck.
It's based on Silverblue instead of Workstation and has very different features, such as Waydroid set up out of the box, they also have a Steam Deck variant that more closely matches the SteamOS experience
I asked the same question when this was posted elsewhere, and the answer that I received is that it is based on the immutable os spin of Fedora, so this is immutable as well.