If I can see the difference I would assume I will be able to see a difference between 27" 4k and 27" 6k.
My canon 80d has a resolution of 6k x 4k.
I also can perceive the sharpness of text.
I don't mind to not run 8k IF driving the display pixels consumes too much energy. The argument of Performance though should not really exist. It's much more pixels true but there are plenty of technics to separate this technically.
Even on gaming they have adaptive rendering but the display resolution itself stays the same.
Hacking back? Another company because an ex employee got hired there?
That's taking the law in your own hand and is clearly NOT ethical.
And sry to say but the homeless person wtf? This dude clearly doesn't understand how we as humans love to interpret things our way.