You want ZFS to be the centre of the NAS.
You care about snapshots, replication, datasets and storage integrity.
You are comfortable learning storage concepts before storing important data.
You want a free community edition and are happy to self-support or use community resources.
You are building a more structured NAS, backup target or lab storage server.
Not necessarily. If Plex still works well for your personal media library, there is no reason to panic-migrate. But if you dislike streaming-service clutter, want a fully self-hosted stack, or are uncomfortable with the direction of Plex’s commercial features, it is sensible to test Jellyfin or Emby alongside Plex before committing to a change. Real-world Plex free movie streaming test.