Correct and what I’ve seen from Jellyfin / Emby are poor looking at best. While I could cobble together a system that works for me, there’s no way anyone I share with would put up with it. Plex is PLEX for a reason.
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If you use plex and jellyfin anyway, i suggest checking raspberry pi and kodi (libre elec) as an alternative. The pi4 is fine for hd at least, some use it for 4k but i have no exp with that. It works well and helps you get off the apple ecosphere.