The point is, the most basic of element; text, is not razor sharp.
Do a test. Stare at the text on a 5k screen for a while. It's blocky.
You yourself said your very own eyesight is chit.
Looking at a 27" 5K retina from 12" is proof you have issues.
Like a deaf person saying their high end surround system sounds like crap.
Case closed......End of discussion....
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