I was going off of this chart[1]. It's true that some people sit relatively close to their TV, but in most of the living rooms that I've been in, the TV has been more than 6 feet away.
This is purely subjective. I could definitely tell the difference from more than 6ft. The picture looks just more life like.
There are people for whom it makes no difference or they don't pay attention to details. Like I have a friend who wouldn't tell 720p from 4k, unless you tell them what to look for and still they wouldn't understand what's the fuss about.
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1. https://i.rtings.com/images/optimal-viewing-distance-televis...