[Bumblonono]

There are plenty of monochromatic cases. Right now hw has a lot of orange.

Dynamic resolution / subpixel rendering. Retina looks really good already, not sure if the effect would be relevant or interesting but it might open up something new

[creshal]

What Apple sells as "retina" still doesn't match common print densities, there's definitely room for improvement.

[Bumblonono]

You make it sound like there is still an easy to spot difference. When i look at the print quality of pictures on a news paper, its the opposite and at least for me, i don't need more than retina and i was very eager to switch to 4k to have higher dpi.

But 14' with retina im very happy.

I'm actually more surprised by hdr on my lg oled 4k. Its actually quite nice when done well.