long article, no explanation what this "immutable" is about.
which is kind of sad...
"immutable" simply means you cannot login / become root and screw up the system by accident.
because / is mounted readonly.
mount -o rw will fix that. that requires an action that cannot happen accidentally. so no excuses anymore, system operators.. :-)
the tech is called snapper. it makes snapshots of filesystem. its been there for 10 years.
you will need to use the transaction mechanism. knowing suse since ages, this is probably going to be automagic, *unless* you turn it off. just like snapper snapshots are right now.
updates / installs become a transaction. which you can roll back. works like a charm. and that is nothing new; its been there (in suse) for a looong time.
its not btrfs only. snapper also used to work with ext4 but will be / is discontinued.
really dont see the issue here. unless one's idea of freedom is the freedom to screw up a system due to blissful ignorance.