The original iPhone screen is almost the size of one icon on the iPhone XS Max

The largest icon size Apple requests for App Store apps, 512px square, is larger than the display of both the original iPhone, and the first Macintosh.

I believe Apple uses this large size for display promotion of the app on its store, not necessarily something it would use in the normal operation of the app.

A typical 32-bit RGBA bitmap, 512 on each side, requires four times the memory as the NeXT Megapixel display.

Whenever there's a post related to phone screen sizes I rush to it in the hopes that there would be an SE alternative being talked about or an Android option that gives control over privacy.