Boils down to bigger TVs. A 50inch tv at 1080p doesn't look so bad. But project it onto something much bigger and things start to look pixelated. 8k sounds like a nice resolution for people who have projectors with 3m diagonals.
It's possible that most people don't realize they are using displays without calibrating them. I assume that a compression system's assumptions of what's visible depends on the proper conversion of DAC input values to voltages. If these assumptions don't hold then artifacts are more visible.
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