https://www.techhive.com/article/578376/8k-vs-4k-tvs-most-co...
What about images that use HDR10+? Or Dolby Vision? What about completely un-compressed lossless video? What about X264 vs X265? What about on an 80-inch screen? What about in dark vs bright scenes? Or even environments? (Human eyes handle images differently at low vs high brightness)
I'm not saying the data is worthless because it's not, but I am saying that I think it's too sweeping to say it's completely un-noticable. Not enough data for that conclusion. Vision and display technology are both very complicated topics and there's always room for improvement IMO.
The only reason it will ever stop is if we hit major technological or even physical barriers. And even then, we'll most likely just move onto another technology that allows yet higher resolution.
"You can't tell the difference between HD and FHD." FHD and QDH. QHD and 4K. 4k and 8K. 60FPS and 120. 120 and 240. A higher resolution texture. Higher resolution audio. A higher resolution mesh. Etc.
Every single time someone makes the claim it makes no difference, yet we do it regardless.
For something that seemingly makes no difference, people sure seem to continue improving it regardless. And shockingly, consumers seem to really enjoy the products too.