Every time I press one of these...
Looking, or rather squinting, at the dark grey text on the black background I am reminded of the Hitchhiker's line:
Every time I press one of these black buttons that're labelled in black on a black background, a little black light lights up in black to let me know I've done it.
And I hadn't noticed it was hatched/striped/whatever until a previous poster pointed it out. It just looks grey at my normal viewing distance. No, actually, it just looks like a different shade of black, hence my first thought of "how many different shades of black have they got". Doesn't look good, looks sloppy.
On the plus side, I can read the font without having to squint!