There's a new Ubuntu Linux desktop on its way
zdnet.com
zdnet.com
However I, like many other folks, have not had the greatest experience with Snap as distribution method, and from a user experience perspective, feel that Flatpak is a better choice in this case, so I won't be entertaining this particular distro's attempts.
Apple has gone this way too and also didn't provide a way for the user to manage things without having to turn every security protection off altogether and also giving up some OS features in the process.
OpenBSD has probably the most cumbersome approach of using multiple partitions and mounting those with system files as read-only. As inflexible as that is (sizing many partitions correctly is an unnecessary nightmare) it's better than Snap which is bloated from the get go.
But if FreeBSD or OpenBSD do something like this, they will make sure it can be managed by the user too, not like Apple.
Not interested.
It's discussed in one of the first two episodes of the Linux Matters podcast talking about the Steam Deck and ChimeraOS.