the retina display is truly stunning.
Id love to have a standalone display with that sort of resolution but they claim that making such displays would be prohibitively expensive..and therefore wont be done.
They make good high display resolution, say this 28” 4K monitor at 157 PPI or 3840 x 2160.
But it’s not a Retina screen level where 250 PPI at 20” viewing distance for a 21.5” screen would be about right for an Apple Retina screen iMac. . . Resolution of 4,675 x 2,625. That would be amazing. I suspect Apple may go lower. . . Maybe 220 PPI. That would be more than good enough at that distance. 4,114 x 2,310.
There are already 4K displays on the market. Way beyond retina.