Is it though? We now have OLED TVs and OLED smartphones.
Where's our OLED PC monitors?
On every measure, if you care about colors/contrast/black+white levels/resolution/density, the average computer monitor has fallen far behind.
You can't even buy a smartphone that has a panel half as bad as most PC monitors on the market. And, at least in my area, you'd actually have to go to a lot of effort to find a non-4k TV.