It's not a flaw ... It's just the way they are designed.
They are good panels, but they are targeted at a sub 500$ device, so they couldn't be like 2000$ professional monitors (and those still have "defects").
There are better and worse, but there isn't a thing like a perfect display.
It's silly to say "I'll buy another brand" since Apple isn't designing nor manufacturing any display, so there are good chances you are going to get a display from the same manufacturer on another brand tablet.
Then why do no other tablets that I've used, my phones, my side lit cheap pc monitor or my LCD TV'S have this issue? If its a design flaw it's most certainly contained to the air and the r mini and apple is simply incompetent.