Last time I used it, syncing the metadata (media details, watched status resume points, etc) across multiple clients wasn't good enough for me.
I have 3 Kodi clients, all on the same LAN, and it never worked properly. I switched to PlexMediaServer, the PlexKodiConnect plugin, and have been relatively happy -- other than Plex knowing what media my generic email address is consuming.
Perhaps I shall take another look at Jellyfin and see if I can move over completely.