That may have been so, when earlier manufacturers were trying to compete and keep their price down.
I think there should be no demonstrable fault with dud pixels these days. I' perfectly happy with one purchased from Novatech in their offers of over 12 months ago.
Simplistic you might say, but I looked at 5 screens from CorelDrw as soon as I got it. They were pure black, white, red, yellow and blue.
No screen showed any sign of imperfections, at least not to my dimming eyes!
I am delighted with it.