grokem :
I think christarp got unfairly down voted. This really is the reaon why the entire monitor industry on the PC side is producing 72-100 dpi monitors. Apple has almost entirely moved to higher 126dpi monitors in most of its lineup.
nope for me. These higher dpi are mostly a waist (Mac or PC)! Except some niches, it only serves people with good eyes who prefer a very clean screen.
BUT, in reality, nothing more is displayed, otherwise it's way too small and unusable to read or to interact with.
The goal is BIGGER resolution with BIGGER screen (or very thin bezels multi-screens) so the DPI is similar. I really don't care so much of all their IPS, MVA or black level... When I code, use office, surf the web, email or play games, I need more real estate, that my hardware can already handle very well.