I think 30fps is not because next gen systems can't do 60fps, developers though feel pressure to have prettier games are trying to achieve more of a superficial accomplishment, by having lower target framerate they can make the games look better. I understand their worries too if they fail to have the best looking graphics on surface they'll get hell for that too.
I wonder too with developers working on meatier hardware if they've not bothered utilizing optimization tricks they've come to use this gen, like variable resolution to keep framerate stable, temporal supersampling, checkerboard rendering.
I read an interesting random article few weeks back about how games have better success optimizing games to target a lower resolution output with smaller texture files to keep overhead down then spruce up the image in post processing is a nice but effective cheat at achieving 4K performance, a significantly better trade-off compared to targeting native 4K output with high resolution textures.
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