[bzzzt]

The first iMac displays were almost certainly 'built to order' for Apple. Later, Dell and LG both had 5K screens, but there were bandwidth problems with the common HDMI and Displayport connections requiring users to plug in two cables. Now the bandwidth is there, but nobody seems to bother making the screens anymore. Since most monitor builders seem to use TV resolution panels (which have much better economy of scale) I'm hoping for a nice 32" 8K monitor someday ;)