I absolutely LOVE Plex and have for a long time--I am a lifetime Plex Pass member. I was so excited for Plex to be on the Apple TV, but it has been nothing but disappointment since. Why did Plex not do their own player for the Apple TV (4)? They have always done such a good job with their native players and the Apple TV is MORE than powerful enough to play ANY file. My Mac Mini however is NOT powerful enough to transcode any file.
I am currently using another player for Apple TV which uses it's own Playback Engine. It is not nearly as nice as Plex--but is plays huge files with high bitrates flawlessly.
Did Plex choose to use the Apple TV playback engine just so that they could get on the Apple TV right away? Are they working on their own playback engine?