The Playlists feature is completely broken.
When I select a video within a playlist view, then after that video plays, I would reasonably expect the following videos in that playlist to queue. They never do.
When I select the play button in a playlist view, then I expect ALL videos in the playlist to queue. Only the very first one does.
When I select the play button in a playlist view, then I expect the HUD to include buttons to navigate to the next video and previous video. No such buttons appear.
Some of these problems happen in certain device configurations but not others. For example, playlists behave somewhat better in Plex Web, compared to Plex Roku, or Plex iOS casting to Chromecast.