Re: What's the point?
Per elementary sampling theory, there's quite a lot of natural high-frequency signal — even in output like text — that cannot be displayed on ~110dpi monitors. It's not just a question of whether you can see the pixels, regardless of what faulty instincts indicate; low-pass filtering can always make the pixels invisible if enough colours are available, just by omitting large parts of the signal.
A monitor like this gets much closer to looking like print than does one with a quarter the resolution. It is therefore a much more comfortable reading experience. It is therefore better for pretty much every purpose.
Put a Chromebook Pixel next to a regular Chromebook or a Retina MacBook next to a regular MacBook. I guarantee you'll see a huge improvement.