True for users who are already setup with Plex, for them there is no reason to switch as of now, but for a person starting from scratch and setting up things for the first time, it makes a lot of sense to get Jellyfin instead of going Plex. As Plex is moving away from their core of making user’s media available for streaming, and rather focuses in pushing its own streaming content (I know we can toggle that behavior off but it is headache fot new comers, and it should be off by default and if a person likes they can turn on Plex’s streaming content, default should be the user’s content)