youxia

It's not "necessary" ANYWHERE. But a nice luxury, I guess.

Is it really 4K? OLED renders pixels differently from traditional LCDs.

How many pixels in the display?

It would be instructive to see it and the next one down the line side by side to see if you can perceive the differences. There might be some "once you have x you can't go back."

Ah, I think I see what you're talking about. Sony Xperia 1 phone, 643 pixels per inch. That's a lot of pixels.

https://www.gsmarena.com/sony_xperia_1-9543.php

iPhone Xs is "only" 448 ppi