Define "couch distance" - as the chart I linked to indicated, a 60" display at 8 feet is only good for 1080p.
That's what I was talking about the Circle of Confusion being not very accurate in terms of real results.
If you go into a real store, from 6' you can easily tell the difference between a 1080 and 4k display with equal content. I go to CES every year and have spent a lot of time looking at different displays that was showing the same content.
"Streams" are for primarily for TV viewing.
Oh, you want to go full pedant? What do you think TS stands for in the MPEG-2 spec (used by every standard DVD ever) - Transfer Stream, that's what. How does "Streams are for TV" make any sense at all? All video is data streams, at least that's how people who understand digital video think of video.
Sorry I got modded up for knowing reality (and digital video) where you sit down at 0 for knowing only theory...