

If you want to play with Atomic distros I’d recommend you do that in a virtual machine in KVM first. They are quite restricting which is good for the distro developers to make consistent releases and experiences for users, and secure, but not necessarily the best option for tech savvy users.
There are ways around the restrictions but you can reach points where the compromises you have to make are too frustrating. If you find that out late down the line after setting up your desktop it can be very annoying. Also I do use Flatpak, but it’s not the most efficient way to run software. Atomic distros have more overhead due to the need to use flatpaks or distrobox and the like to get everything you might want.
Atomic distros are a neat idea but I personally love tweaking every element of my install and optimising or customising it. So I use a rolling release distro, have my home folder on a separate partition, and back up regularly.
There is an official Jellyfin plugin that adds DLNA support; content can then be accessed via any DLNA client including VLC (built in support). MPV can also use DLNA with it’s own plugin.