https://www.rtings.com/tv/reviews/by-size/size-to-distance-relationship

Extensive write up on this whole issue, even includes a calculator tool.

But, basically:

Yeah, going by angular resolution, even leaving the 8K content drought aside....

8K might make sense for a computer monitor you sit about 2 feet / 0.6m away from, if the diagonal size is 35 inches / ~89cm, or greater.

Take your viewing distance up to 8 feet / 2.4m away?

Your screen diagonal now has to be about 125 inches / ~318cm, or larger, for you to be able to maybe notice a difference with a jump from 4K to 8K.

........

The largest 8K TV that I can see available for purchase anywhere near myself... that costs ~$5,000 USD... is 85 inches.

I see a single one of 98 inches that is listed for $35,000. That's the largest one I can see, but its... uh, wildly more expensive.

So with a $5,000, 85 inch TV, that works out to...

You would have to be sitting closer than about 5 feet / ~1.5 meters to notice a difference.

And that's assuming you have 20/20 vision.

........

So yeah, VR goggle displays... seem to me to be the only really possibly practical use case for 8K ... other than basically being the kind of person who owns a home with a dedicated theater room.

At 1.6 meter for the metric minded. If you really stretch out and can hit the tv with your toes it's about the right distance.

You’re describing my bedroom tv.

you're*

It's not hard, get it right.