I recently switched my server over to running Plex and Home Assistant in Docker. I like the ease of transfer (just move my compose file and one directory where I have stored all the configs and I'm set) as well as the simple permissions management to give access to directories.
I have only used Fedora briefly, but I am considering it instead of my usual openSUSE because it is "officially supported" for the Framework 13 I have on order. I saw the immutable versions and the idea seems cool though I don't really understand what new I would need to learn or really what benefits it would have.
Is the concept overkill for a single-user laptop?
Yes.