I think I stated badly. I wrote they fade, but not completely: that's not what I meant. It happens that letters fade a little, and become thinner, but I can read nevertheless.
So, my question is: what do you mean when you're complaining that your device's fading under sunlight? Is it fading completely? Is it fading a little? Do letters get thinner?
I say: if you say letters get thinner, my answer is "yeah, that's an ordinary thing"
I think most people who are complaining misunderstand this point.