It’s a more private/personal experience. Turning on the TV means everyone watches.
> It’s common on open floor plans / large rooms for a couch to end up in a completely arbitrary distance from a TV rather than next to a wall. Further setting up the TV on the width vs length vs diagonal of a room commonly provides two or more options for viewing distance.
You’re essentially arguing that people can arrange their furniture for the best viewing experience. Which is true, but also not what people actually do.
The set of people willing to arrange their furniture for the best movie watching experience in their home are the least likely to buy a small TV.