For me it's two things: 1. You have to use their login service to log into a server that's... self-hosted. 2. The Plex app has very limited codec support, at

For me it's two things: 1. You have to use their login service to log into a server that's... self-hosted. 2. The Plex app has very limited codec support, at least on iOS. In particular, I rip directly from disc and Plex would require transcoding for UHDs, or Blu-rays with TrueHD/DTS/etc. audio. Infuse has support for all of that out of the box so my Jellyfin server doesn't do any transcoding at all, and AppleTV/iPad/etc. are more than capable of decoding even full bitrate UHD content.