Heck, for 10 years I've seen people watching 4:3 TV on 16:9 screens, horribly stretched. People are almost blind, seriously. They'd tolerate about anything.
HFR and HDR on the other hand, are great. I've seen HDR/HFR demos in 2K at Amsterdam IBC and it looks much better (much more realistic) than standard 4K.
8K? The NHK makes 8K demos, and they can only show almost still images, else you only have extremely detailed motion blur at ordinary framerates. They even give you a magnifying glass to look at their 8K screen. That's impressive, but I don't plan watching movies through big lenses to catch the details, anyway. What's the point, apart from planned obsolescence?