My personal opinion.
The text is not white. It is an easy on the eyes off white perhaps grey white. I find it easier to look at than the bright white background with stark black letters that is presented to me by the editor while I was writing this post.
I think the "white on black easy on the eyes" is why so much computer hardware is black. My keyboard was black with white letters. I changed for a black frame, white keys and black letters because I often have a low light situation. I can't see the white letters on black keys very well. Again my keys on my keyboard are off white. There are not the bright tidy white that I am getting with the forum post editor.
Unless stated otherwise, all content in this post is My Personal Opinion.