well part of my issue is that there is a huge gap with all the common monitors being stuck at 70 to 90 ppi in general and so few "desktop" displays that go past 90ppi.
300ppi is a "nearly ideal goal" for having displays where we stop even counting the dots and just enjoy it.
but in the mean time I would like to see desktop displays that are more than 100 ppi be more common. in laptops they do it, why not for a desktop screen ?
You do know that "retina" isn't based on ppi, right? It's a fuzzy term invented by Apple that means "you shouldn't be able to perceive pixels at a normal viewing distance". A "normal viewing distance" is not specified, and is going to vary greatly depending on the device. The 15" MacBook Pro retina display has a 220 ppi, for instance, not the 300 ppi of the iPhone retina display.