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How so? It has sufficiently high PPI, you won't be able to see individual pixels. Going higher is pointless.

If going higher is pointless, why does the iPhone XS has a PPI density of 458? They should have stayed at 326 in that case as well.

OLED needs higher pixel density to achieve the same level of “sharpness”. That’s why LCD’s can looks as crisp at much lower PPI.