One thing he neglects to consider is the difference between a desktop and a laptop - the effective DPI of a screen is dependent on how far away it is from your

One thing he neglects to consider is the difference between a desktop and a laptop - the effective DPI of a screen is dependent on how far away it is from your eyes. This is why 1920x1200 is a great resolution for a 17" laptop, but only comfortable on a larger desktop screen.