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> Why update a static screen at 120 fps?

Good thing it doesn't do that then, variable refresh rate displays that go down to 1 Hz are fairly standard now on phones as well as other displays.

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Even before that, mobile UI frameworks are retained mode GUIs, not immediate. They aren't drawing to a blank framebuffer 120 times a second if they don't have to. Redraws only happen when something changes (e.g. "Dirty" rects).

Oh even immediate UI framework don't paint non-stop. If the UI has not been interacted with, or if there are no animations/gifs, it has no blimey reason to repaint, and it will not. It will repaint the whole screen, of course, but that's already a win.

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