That's somewhat true. However, the hardware support in bsd especially around video has been blah. If you are interesting in playing with zfs on linux I would recommend proxmox. That particular os is one of the few that allows you to install on a zfs rpool from the installer. Proxmox is basically a debian kernel that's been modified a bit more for virtualization. One of the mods made was including zfs support from the installer.
Depending on what you get if you go the prox route you could still install bsd in a vm and play with filesystem. You may even find some other methods to get jellyfin the way you like it with lxc, vm, or docker.
I started out on various operating systems and settled on debian for a long time. The only reason I use prox is the web interface is nice for management and the native zfs support. I change things from time to time and snapshots have saved me from myself.