I wonder whose system they are using.

Sounds like BlueRay Remux and Web Downloads are what you should be looking for. Radarr and Sonarr shine at this.

High quality audio can consume a great deal of disk space, but it’s probably going to unavoidable if you’re looking for releases with multiple audio and subtitle tracks available. I would not exactly call this rare anymore, but it’s definitely not the default so you want to wait until after you have search and download working across the board.

The only thing I didn’t see on your list is any type of library optimization. I kind of gave up on it myself because it’s faster for me to just redownload something than recompress it, and that’s their major use case… but you might find utility in removing additional audio or subtitle tracks, or to rearrange defaults.

Handling additional data streams like subtitles and multiple languages is not quite as mature, hardware players often have strong preferences. Something to keep in mind as your planning out your setup.

I think you're making a good case against an Internet enabled pacemaker ;-)

I was afraid there was going to be more advanced fingerprinting, there usually is when it’s more than a polite suggestion like that :-(