@gregkinney sorry for any confusion–the Shield also passes through all the audio formats and HDR, it was just a hassle to control in a smooth way over IR and I didn’t like the interface that much. The Shield is very well known for basically being the only streaming box that can handle all the audio and video formats (possibly not Dolby Vision, but my projector doesn’t support that either, so I don’t care) for Plex, which is why I picked one up initially. It was an experiment to see if I could avoid having to build a new HTPC. I wanted to stick with Plex since everyone in the house was familiar with the interface.
My HTPC isn’t anything special–a spare computer I had with an nVidia … GTX 960, I think, running Windows 10 and Plex HTPC. In my other theater I had an older Intel NUC running Windows 7 and Plex Home Theater (which I personally think had the nicest interface of all of 10-foot Plex incarnations) and a 1080p projector and that served us well for years. Unfortunately, the NUC couldn’t do 4k or HDR, so when we built the new theater I needed new hardware. Plex on a Shield and Plex HTPC on a HTPC can definitely play 24fps, 4k, and HDR and can pass through all the audio formats. There have been a few quirks, but in general we’ve been very happy with it. I believe Plex HTPC requires Windows for HDR–I don’t think HDR works under the linux one yet.
As for controlling the HTPC, that’s why I created my MCE Controller plugin.