If your device doesn’t have a client it probably has a kodi port. Jellyfin libraries can be imported in kodi with plugins (and plex and emby for that matter). Then you get the benefits of kodi (better skin support, more robust plugins, better subtitle rendering, etc) with the centralized metadata administration of Jellyfin and retain the option to use Jellyfin clients on devices with locked ecosystems (eg ios) or where you don’t feel like setting up kodi