I HATE gray text. I haven't had a single book with gray on white, not a single newspaper with gray on white, what is this gray-on-white trend in the internet, I don't understand it. But that's illegible, that's an eyesore, and if I were to have to read it, I'd first go to the dev console and change the foreground colour.
>> Black on white? How often do you see that kind of contrast in real life?
I mean where these people live? Don't they read anything on paper? Don't they look ad ads on the road, ads on TV. God, is this a plot on our eyes?.
If it's well done, you don't immediately realize the text isn't exactly black. You'd have to have a closer look to find that out.
The paper color of good books isn't glaring white, either, but has a slight yellowish tint. FWIW, I think the background color of HN might be a nod to that.