I suspect the use of immutable SteamOS will begin to creep into the desktop space. Developers will love it because they can build exactly one repo and call it a day.

Fedora Silverblue does this. It’s a cool experience where you primarily use flatpaks, or containers for legacy / dev work, it would work great on a phone.

You can also fork the OS and customize the base installation and share it from a container registry. It would be awesome from the “I am my family’s IT support person” perspective.