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The scaling makes sense for legacy apps, but I can't understand why they don't present a 1920x1080 screen for everything else.

Hasn't iOS had tools for building resolution-independent apps ever since the iPhone 5 was released?

Probably because 1080p as a @3x screen gives a smaller effective viewport than the lesser models, which would make it look weaker?

No, iOS has had tools for building apps with flexible canvases, that has very little to do with the resolution of the screen these days.