Can't tell if this is sarcasm or not, but I think that's sort of the point. You want a high enough pixel density so you can't perceive pixels at normal viewing distance, and I can definitely see pixels on my 42in 1080p screen from across the room.
I use a 65" 4k TV with my HTPC in the living room, but often do desktop-ish things on it. (Logitech's wireless keyboards are great).
The difference in resolution between 1080 and 2160 is huge. 1080 is just fuzzy.