[raverbashing]

1 No, you really can't account that. You can't account for people's eyes as well. You may make a guess (maybe on display resolution) which is not precise at all.

2 Google does an can certainly work with whatever they want, but they should try the big improvements first. Their work with page loading times is great, and that has been shown to correlate with earnings. But trying to tune the shades when there are more important things to be worked is pointless

3 It goes to show they don't understand design. In some aspects they do (like GMaps) but it seems to be declining