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JEMC said:

Let's not forget the Lens Flare effect... which is one of the most absurd things you can add intentionally as it doesn't happen in the real world.

It happens in, well, lenses. I suppose the idea is that you're watching footage through a film camera, which also explains film grain, chromatic aberration, and motion blur.

DoF is a real thing due to Rayleigh scattering so I keep it on, though often in games it happens far closer than it does in real life since game environments are rarely that big.