Really well explained - I use fedora kinoite, and have had hard time grasping how the immutability exactly works when compared to traditional setup.

I would add to this that homebrew is a nice tool for being able to install software that are not in flatpaks and if you do not want to add too many layers to the "os-tree".

The fact that home is shared between all the distro- and toolboxes is a bit annoying, because I would like to have stronger isolation from the host in some projects.

Also doing basic polyglot stuff is a bit messy, if you have toolboxes like "node" and "php". But if you have project based boxes, then you end up with billion copies of node.

But what a pleasure it is to just update the base image and have things work, or rollback if something fails. Hell, you can even rebase the base image to some other setup, and most likely have your system work.