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I wonder if this can help a game like Horizon FW, with lots of high frequency detail constantly changing frame to frame.

Waving foliage flickering in performance mode is still not fixed and might not be possible to fix. Upscaling what looks like 'static' noise is very tricky. Either you make the whole image very soft like FS2020 does with their TAA implementation for upscaling, or you get sharpened high frequency mess.

It's a trade off, more detail means more high frequency contrast, which is harder to upscale. Lower detail, you don't really need 4K, but maybe it will help with RT to maintain a steady fps.