What about the old lens flare when a light source comes round from behind a planet?

Why even on 3d this is still added even when is actually blocking the view of a scene?

Becaus in a real camera, it would do this, and the idea of a camera looking at this gives a realistic perspective, even when it wasn't "filmed".

There is a new wave in the last 5 years or so, to do more "realistic" scenes.

War movies with shaky cameras, tight shots, fast pans, blured auto zoom delays, random unclear gun noises, to copy how press cameras sound when covering some kind of battle.

As noted in "firefly" and "galactica" they have gone for the closest thing to reality, which would be a sort of "camera mounted in another ship" point of view. It shakes and moves randomly, it blurs when it can't catch up with the action, and I think it adds a lot of realism.

I believe is the imperfections that make the unreal appear real, even at the cost of obscuring or bluring detail and artwork.

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-'I curse the day my curiosity led me to investigate the strange stain inside
the atomic acelerator chamber'-
The Nuked Bug