As another commenter pointed out Apply/Google seem to set design trends, as evidence of this take a look at OmniFocus (a professionally built Mac App). It loves

As another commenter pointed out Apply/Google seem to set design trends, as evidence of this take a look at OmniFocus (a professionally built Mac App). It loves to use grey text on white. I used to use this program extensively, but found my eyes grew tired while using the app. Note, I raised this with the Omni team and their response was to add theming support. Sigh, so now I can customize a better contrast. What about all those other folks that simply don't know why their eyes get tired after using these beautiful displays.