Why is it not mounted on the host/cointainer? I dont think you are using jellyfin “wrong” but its not like you cant just configure a mount point if you wanted to use jellyfin with it.
That is an interesting thing to point out though, im not actually sure but i think they used to support smb shares directly, i might just be thinking of kodi though.
Well it seems to “work” in that they will be isolated, but id argue it also is counter productive because it helps them grow their isolated communities by playing the victim. However it is probably less counterproductive then trying to engage with them, which is both pointless and a waste of time.