Immutable OS’s are increasingly popular. While some types of software are harder to install, the system being harder to break is very appealing. I know if I setup my wife/kids/parents with a Linux OS I would go with an immutable OS to reduce how much they could accidentally break.

Big thing is SteamOS needs a way to install traditional packages permanently. Other immutable OS’s usually offer an option to reboot to install packages not otherwise available/viable through flatpak or distrobox/nix.